Artifacts

Artifacts are base weapons that have special models, names, stats, and effects.

Arming Sword

Kuma's Claw

-

Physical Base Weapon Damage 34

-

-

Move Speed -20

-

-

Successful weapon attacks deal 15 Dark Magical Base Damage (100% Scaling).

-

Required Class:

Fighter,Ranger,Bard

Weapon Type:

Sword

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

48.46x8.86x1.98

Gear Score:

100

Sell Price:

1000

Item Achieve:

30

Forged from the flames of a mighty black dragon, this sword claws at the target's soul, inflicting lethal damage.

Falchion

Kuma's Fang

-

Physical Base Weapon Damage 41

-

-

Move Speed -25

-

-

Successful weapon attacks deal 15 Dark Magical Base Damage (100% Scaling).

-

Required Class:

Fighter,Bard,Warlock,Sorcerer

Weapon Type:

Sword

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

48.98x9.57x2.3

Gear Score:

100

Sell Price:

1000

Item Achieve:

30

Seems the great black dragon has lost a tooth... No matter, it will continue its bloody purpose.

Longsword

Fulgor

-

Physical Base Weapon Damage 45

-

-

Move Speed -30

-

-

Gain 10% Action Speed. Successful weapon attacks summon a thunderbolt to strike the target dealing 20 Lightning Magical Base Damage (100% Scaling) and causing them to suffer -20% Move Speed Bonus for 1 second.

-

Required Class:

Fighter,Warlock,Sorcerer

Weapon Type:

Sword

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

80.41x17.14x2.42

Gear Score:

130

Sell Price:

1000

Item Achieve:

40

Long ago, a King was gifted this artifact by someone who valued his sense of dream, justice, love and kindness, hoping to help him carve these principles into the world.

Rapier

Viola

-

Physical Base Weapon Damage 27

-

-

Move Speed -15

-

-

Successful weapon attacks deal 10 Ice Magical Damage (100% Scaling), and frostbites the target for 2 seconds, causing them to suffer -20% Move Speed Bonus and -20% Action Speed

-

Required Class:

Ranger,Rogue,Bard

Weapon Type:

Sword

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

55.58x13.34x6.92

Gear Score:

100

Sell Price:

1000

Item Achieve:

30

The chill of winter flows in the wake of this icy blade. Gifted from the Winter Fae who wanted to prove there is nothing stronger than the cold bite of their domain.

Short Sword

Bloodsap Blade

-

Physical Base Weapon Damage 27

-

-

Move Speed -15

-

-

Dealing physical damage to an enemy heals you for 1 Magical Base Healing (0% Scaling)

-

Required Class:

Fighter,Rogue,Ranger,Bard

Weapon Type:

Sword

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

37.48x7.61x1.34

Gear Score:

40

Sell Price:

80

Item Achieve:

9

A dark ritual imbued this sword with the essence of a vampire's curse. This blade not only cuts flesh but siphons the spirit, feeding its master with each drop of blood spilled.

Crystal Sword

Catice

-

Physical Base Weapon Damage 13

-

-

Magical Base Weapon Damage 21

-

-

Move Speed -25

-

-

Upon hitting a target or object, the blade violently shatters. If the blade hits a target, shatter will deal up to 25 Ice Magical Base Damage (100% Scaling). The broken blade regenerates to its original state over 4 seconds, reducing shatter damage to (?) until the blade is fully reformed.

-

Required Class:

Wizard,Warlock,Sorcerer

Weapon Type:

Sword, MagicStuff

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

54.87x10.57x1.42

Gear Score:

130

Sell Price:

1000

Item Achieve:

40

A sword forged from the shards of the Ice Queen's tears. Though fragile and prone to breaking, its fierce icy blade summons delicate whirlwinds of snowflakes, reforming itself to its original form.

Zweihander

Bloodthirst

-

Physical Base Weapon Damage 49

-

-

Move Speed -40

-

-

Successful weapon attacks have 20% Lifesteal and inflict a Bleed for 30 Neutral Base Damage (100% Scaling) over 5 seconds (max stacks of 1).

-

Required Class:

Fighter,Barbarian,Warlock

Weapon Type:

Sword

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

80.53x16.92x7.4

Gear Score:

130

Sell Price:

1000

Item Achieve:

40

This massive sword was tempered in uncountable rivers of blood. Still insatiable, it drives its wielder to crave more until their final breath.

Stiletto Dagger

Deathbloom

-

Physical Base Weapon Damage 23

-

-

Armor Penetration 5%

-

-

Move Speed -10

-

-

Successful weapon attacks cause a death flower debuff to build on the target, lasting 30 seconds. At 3 stacks, the death blossom explodes dealing 30 Evil True Magical Base Damage (0% Scaling) to the target.

-

Required Class:

Rogue

Weapon Type:

Dagger

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

25.72x4.55x2.3

Gear Score:

100

Sell Price:

1000

Item Achieve:

20

Thou love me, thou love me not... Thou love me, thou love me not...

Rondel Dagger

Haze Blade

-

Physical Base Weapon Damage 18

-

-

Armor Penetration 5%

-

-

Move Speed -10

-

-

Successful weapon attacks cause drunken dizziness state for 3s.

-

Required Class:

Wizard,Rogue,Bard,Druid

Weapon Type:

Dagger

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

25.94x2.99x2.99

Gear Score:

40

Sell Price:

80

Item Achieve:

6

In a late-night escapade, a tipsy wizard and an equally sloshed blacksmith clumsily combined their crafts, spilling enchanted ale on a blade mid-forging. The result was this bewitched sword, leaving foes as befuddled and dazed as its creators on that fateful evening.

Morning Star

Pulverizing Prayer

-

Physical Base Weapon Damage 39

-

-

Armor Penetration 15%

-

-

Move Speed -25

-

-

Crushes the enemy's armor with each weapon hit, causing the target to suffer -25% Physical Damage Reduction for 10 seconds, stacking up to 3 times and refreshing on each new stack.

-

Required Class:

Cleric,Druid

Weapon Type:

Mace

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

42.35x9.5x9.4

Gear Score:

100

Sell Price:

1000

Item Achieve:

30

Gifted to a holy fighter long ago by a demi-god, proving faith is also a powerful weapon, crushing all non-believers.

Quarterstaff

Stinky Stick

-

Physical Base Weapon Damage 41

-

-

Armor Penetration 10%

-

-

Move Speed -30

-

-

Successful weapon attacks emit a poisonous cloud which lasts 12s and causes 15 Neutral Magical Base Damage (0% Scaling) per second. Up to 3 clouds can exist at once. Holding this stick makes you immune to poison clouds.

-

Required Class:

Barbarian,Wizard,Cleric,Warlock,Druid,Sorcerer

Weapon Type:

Mace, Staff

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

86.59x3.91x3.43

Gear Score:

130

Sell Price:

1000

Item Achieve:

50

Pee-eewh! This thing reeks....

Halberd

Cinder

-

Physical Base Weapon Damage 63

-

-

Move Speed -45

-

-

Successful weapon attacks sears the target for 10 Fire Magical Base Damage (100% Scaling) and burns them for 27 Fire Magical Base Damage (50% Scaling) over 9 seconds.

-

Required Class:

Fighter,Warlock

Weapon Type:

Polearm

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

119.7x15.84x2.14

Gear Score:

130

Sell Price:

1000

Item Achieve:

100

It will be difficult to keep track of your kill count for they have all been reduced to a pile of ash.

Battle Axe

Echo of Screams

-

Physical Base Weapon Damage 56

-

-

Move Speed -30

-

-

Successful weapon attacks deal 20 Evil True Magical Base Damage (0% Scaling) to the target and causes the victim to hear screams, deafening them for 3 seconds

-

Required Class:

Fighter,Barbarian

Weapon Type:

Axe

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

65.48x14.71x2.79

Gear Score:

130

Sell Price:

1000

Item Achieve:

80

An ancient axe imbued with the screams of fallen enemies, granting its wielder a deadly strength that comes from the echoes of the past.

Double Axe

Life after Death

-

Physical Base Weapon Damage 58

-

-

Move Speed -35

-

-

When receiving a lethal attack, HP is set to 1 and become invincible for 3 seconds. This effect can only be triggered once during an adventure for this specific Life after Death. Any Life after Death can only be used every 12 seconds.

-

Required Class:

Barbarian

Weapon Type:

Axe

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

72.75x19.43x2.64

Gear Score:

130

Sell Price:

1000

Item Achieve:

80

Death comes for us all one day...
Is today that day?

Felling Axe

Soulscraper

-

Physical Base Weapon Damage 48

-

-

Move Speed -30

-

-

Successful weapon attacks absorb the opponent's soul to gain 5 Strength and Vigor for 12 seconds, stacking up to 3 times and refreshing on each new stack.

-

Required Class:

Barbarian

Weapon Type:

Axe

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

56.51x13.29x2.18

Gear Score:

130

Sell Price:

1000

Item Achieve:

80

Through a bond that transcended realms, a guardian of souls granted a mortal companion this enchanted axe.

Horseman's Axe

Famine

-

Physical Base Weapon Damage 35

-

-

Move Speed -22

-

-

Successful weapon attacks render the target unable to receive any Healing effects for 20 seconds.

-

Required Class:

Fighter,Barbarian

Weapon Type:

Axe

Slot Type:

Main-Hand

Hand Type:

One Handed

Hitbox:

56.75x8.99x2.17

Gear Score:

100

Sell Price:

1000

Item Achieve:

30

This enchanted axe is crafted by infusing the blood and essence from the third of the legendary Four Horsemen.

Longbow

Nipalan

-

Physical Base Weapon Damage 42

-

-

Armor Penetration 20%

-

-

Move Speed -50

-

-

Successful weapon attacks have 3 Physical Buff Weapon Damage and push the hit target forward.

-

Required Class:

Ranger

Weapon Type:

Bow

Slot Type:

Main-Hand

Hand Type:

Two Handed

Quiver Size:

6

Hitbox:

93.7x37.48x5.93

Gear Score:

130

Sell Price:

1000

Item Achieve:

40

A bow crafted by a legendary tribe of warriors known as the Penobscots. So terrifyingly strong it knocks back their foes.

Recurve Bow

Pestilence

-

Physical Base Weapon Damage 36

-

-

Armor Penetration 10%

-

-

Move Speed -40

-

-

Successful weapon attacks inflict a disease that deals 20 Neutral True Magical Base Damage (50% Scaling) over 4 seconds.

-

Required Class:

Ranger

Weapon Type:

Bow

Slot Type:

Main-Hand

Hand Type:

Two Handed

Quiver Size:

8

Hitbox:

70.24x35.45x19.56

Gear Score:

130

Sell Price:

1000

Item Achieve:

30

Capable of spreading poison that will have it's victims begging for death, this cursed bow once belonged to first of the legendary Four Horseman.

Survival Bow

Elven Bow of Truth

-

Physical Base Weapon Damage 26

-

-

Armor Penetration 5%

-

-

Move Speed -30

-

-

Gain 25% Action Speed and shot arrows fly in a straight line without being affected by gravity.

-

Required Class:

Ranger,Bard

Weapon Type:

Bow

Slot Type:

Main-Hand

Hand Type:

Two Handed

Quiver Size:

10

Hitbox:

61.51x35.45x17.26

Gear Score:

130

Sell Price:

1000

Item Achieve:

30

A bow made by the elves by forging the branches of the tree of truth.

Heater Shield

Aegis

-

Armor Rating 36~38

-

-

Move Speed -15

-

-

Can deflect projectile and hitscan spells while in defensive stance. After the reflection is triggered, you remain able to reflect for 8 seconds, and cannot reflect again for a 12 second cooldown in the form of a debuff after the activation period.

-

Required Class:

Fighter,Cleric,Warlock

Weapon Type:

Shield

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

39.37x31.34x10.33

Gear Score:

75

Sell Price:

1000

Item Achieve:

60

Crafted by a powerful and mysterious being to aid in eliminating magic users. He saw wizards lust for magic, fearing they would grow too powerful.

Buckler

Delirium

-

Armor Rating 27~28

-

-

Move Speed -7

-

-

When actively wielded, lose 5% Max Health Bonus, but regenerate 2 health per second (0% Scaling).

-

Required Class:

Fighter,Cleric,Bard

Weapon Type:

Shield

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

25.77x25.77x5.54

Gear Score:

75

Sell Price:

1000

Item Achieve:

40

Created by a mad alchemist, using dragon's blood in some of his creations. Beware, its side effects can be just as potent as they are perilous.

Round Shield

Dryad's Wrath

-

Armor Rating 30~31

-

-

Move Speed -12

-

-

Gain 1 Impact Resistance. Blocking a melee attack deals 30% of the damage blocked to the opponent.

-

Required Class:

Fighter,Cleric,Barbarian

Weapon Type:

Shield

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

34.02x34.02x4.51

Gear Score:

75

Sell Price:

1000

Item Achieve:

60

Crafted using spirit wood by a powerful ancient Druid who received permission from the forest Dryads to imbue it with the power of nature.

Buckler

Thorn Shield

-

Armor Rating 25~26

-

-

Move Speed -7

-

-

Returns 5 True Physical Base Damage to the attacker on blocking an attack.

-

Required Class:

Fighter,Cleric,Bard

Weapon Type:

Shield

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

25.67x25.67x5.49

Gear Score:

30

Sell Price:

80

Item Achieve:

12

Forged in the heart of a cursed thicket where the blood of a fallen hero was spilled, this shield harbors his vengeful spirit, eager to right ancient wrongs with every calculated parry.

Spellbook

Spellweaver

-

Physical Base Weapon Damage 25

-

-

Gear Magical Damage 7

-

-

Move Speed -10

-

-

Magical Penetration 5%

-

-

Successful spell casts grant 5% Spell Casting Speed, up to 5 times. The effect lasts for 5 seconds and is reset on each new stack.

-

Required Class:

Wizard,Cleric,Warlock,Druid,Sorcerer

Weapon Type:

MagicStuff

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

12.75x21.25x5.55

Gear Score:

100

Sell Price:

1000

Item Achieve:

40

A rare spellbook pulsing with arcane energy, whispering ancient secrets in an unknown language. Rumored to have been taken from a mysterious land only accessible through special portals.

Magic Staff

Illusory

-

Physical Base Weapon Damage 36

-

-

Gear Magical Damage 10

-

-

Move Speed -20

-

-

Magical Penetration 15%

-

-

Successful spell casts grant invisibility for 4 seconds and leaves the user's illusion in their place temporarily.

-

Required Class:

Wizard,Cleric,Warlock,Druid,Sorcerer

Weapon Type:

MagicStuff, Staff

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

81.86x6.35x3.84

Gear Score:

130

Sell Price:

1000

Item Achieve:

40

Rumored to be crafted by a powerful yet mischievous trickster from another realm, who delighted in confusing and outsmarting their enemies.

Magic Staff

Spellplunder Rod

-

Physical Base Weapon Damage 33

-

-

Gear Magical Damage 7

-

-

Move Speed -20

-

-

Magical Penetration 15%

-

-

Successful weapon attacks restore 24 Skill/Spell Points per hit when attacking.

-

Required Class:

Wizard,Cleric,Warlock,Druid,Sorcerer

Weapon Type:

MagicStuff, Staff

Slot Type:

Main-Hand

Hand Type:

Two Handed

Hitbox:

81.86x6.35x3.84

Gear Score:

50

Sell Price:

80

Item Achieve:

12

The final project of a sorcerer who vanished under mysterious circumstances. Imbued with forbidden magic, it not only steals spells but also echoes with the anguish of those whose magic it has seized, a grim companion thirsting for arcane power.

Crystal Ball

Zirkzi's Eye

-

Physical Gear Weapon Damage 4

-

-

Gear Magical Damage 9

-

-

Move Speed -15

-

-

Magical Penetration 10%

-

-

Successful spell hits apply Death's Gaze, dealing 2 Evil True Magical Base Damage (0% Scaling) to the enemy. This effect has a 0.5s cooldown in the form of a debuff.

-

Required Class:

Wizard,Warlock,Druid,Sorcerer

Weapon Type:

MagicStuff

Slot Type:

Off-Hand

Hand Type:

One Handed

Hitbox:

8.85x8.85x8.85

Gear Score:

100

Sell Price:

1000

Item Achieve:

40

Unable to defeat a hopelessly powerful demi-god, an ancient sorcerer sacrificed his life to seal one of the demi-god's eyes in a crystal ball.

Adventurer Boots

Stillmend Boots

-

Armor Rating 28~29

-

-

Dexterity 5

-

-

Move Speed 5

-

-

When standing still, recover 1 Physical Base Healing (0% Scaling) every 5 seconds.

-

Slot Type:

Foot

Gear Score:

30

Sell Price:

80

Item Achieve:

12

Crafted from the hide of the mythical Earthwalker, these boots carry the creature's regenerative magic. They mend wounds with the stillness of ancient magic, restoring vitality with each rooted pause.

Heavy Leather Leggings

Tanglethread Trousers

-

Armor Rating 66~67

-

-

Vigor 5

-

-

Move Speed -6

-

-

Reduces an enemy's Move Speed Bonus by -5% for 2s when attacked.

-

Slot Type:

Legs

Gear Score:

30

Sell Price:

80

Item Achieve:

18

Crafted by a renowned tailor, commissioned by beings of both shadow and light, these trousers rank among his most coveted creations. Highly prized by collectors and adventurers alike, they feature a unique thread pattern—his signature, marking the work of a tailor with unparalleled skill.

Lantern

Wanderlight Lantern

-

Move Speed 1

-

-

Reveals the footprints of enemy players within 2.5m.

-

Type:

LightSource

Stack Size:

1

Gear Score:

30

Sell Price:

80

Item Achieve:

12

In a prosperous era, Toz, the loyal court wizard of the king, created these lanterns. Harnessing his growing powers, he equipped the elite guard with these beacons, aiming to protect against dangers that would otherwise remain unseen.

Methods of Obtaining Artifacts in High Roller

A few of these used to be ground loot but now have been moved into containers in their respective rooms, the drop chance remains.
All of this information is up to date for HF #53 but not Patch:6.8.5#Hotfix 90 and assumes 0 Luck. The concepts remain the same, but the numbers won't be adjusted every hotfix.

Key Loot (Minibosses)

Frost Skeleton Champion/Yeti Frost Iron key 10%

Giant Centipede /Goblin Skeleton Champion Mystic stone 10%

Skeleton Champion Gold key 25%

Giant Worm Old Rust key 30%

Key Loot (Bosses)

Banshee/Spectral Knight 50% Old rust key, 40% Gold key, 10% Skull key

Skeleton Warlord/Lich 80% Gold key, 20% Skull key

Ghost King 80% Skull key

Frost Wyvern 80% Frost Iron key

Cave Troll/Cyclops 18% Blood 50% mystic stone

Hoard
Hoard Weapon/Armor/Accessories Drop Rate is ?% Uncommon, ?% Rare, ?% Epic, ?% Legendary, 1-3% Unique, 0% Artifact. There is 0% chance to hit an Artifact.

Gold coin chest for Boss Hoard
0.01% (PVE), 0.02% (N), 0.15% (HR)
Gold coin chest for Hoard
0.01% (N), 0.05% (HR)

Cave Troll 0% chance

Cyclops 0% chance

Banshee 0% chance

Spectral Knight 0% chance

Skull Key Room
Skull Key room weapon's Drop Rate is ?% Epic, ?% Legendary, 35% Unique, 0.75% Artifact. So overall the Skull room has a 0.75% chance to drop an Artifact per hit.

Note: Frozen Iron Key Room has the same odds as the Skull Key Room.25% Unique , 0.75% Artifact. So overall the Frozen Iron Key Room has a 0.75% chance to drop an Artifact per hit.

Golden Key Room
Golden Key room weapon's Drop Rate is ?% Epic, ?% Legendary, 15% Unique, 0.25% Artifact. So overall the Golden room has a 0.25% chance to drop an Artifact per hit.

Mystic Gem Room
Mystic Gem room weapon spawn's Drop Rate is ?% Epic, ?% Legendary, 10% Unique, 0.25% Artifact. So overall the Mystic Gem has a 0.75% chance to drop an Artifact per hit.

Dual Boss Treasure Room
Double Boss room ground loot's Drop Rate is ?% Epic, ?% Legendary, 15% Unique, 0.25% Artifact (for the weapon).
So overall the Dual Boss Treasure (weapon) room has a 0.25% chance to drop an Artifact per hit.

Old Rust Room
Double Boss room ground loot's Drop Rate is ?% Epic, ?% Legendary, 10% Unique, 0.1% Artifact (for the weapon).
So overall the Old Rust room has a 0.1% chance to drop an Artifact per hit.

Inferno Bosses (Lich)
Lich's Weapon/Armor/Accessories Drop Rate is ?% Epic, ?% Legendary, 35.5% Unique, 0.5% Artifact
Different bosses may have different amounts of artifacts relative to total items on the table. Currently each "Hell" boss has 5 Artifacts in their respective loot table.
Technically 0.5% chance per loot roll for Artifacts.
But the lich rolls this drop table 3 times.
So overall the Lich has approximately 1.5% chance to drop an Artifact per kill.

Inferno Bosses (Warlord)
Warlord's Weapon/Armor/Accessories Drop Rate is ?% Epic, ?% Legendary, 35.5% Unique, 0.5% Artifact
Technically 0.5% chance per loot roll for Artifacts.
But the lich rolls this drop table 3 times.
So overall the Warlord has approximately 1.5% chance to drop an Artifact per kill.

Inferno Bosses (Ghostking)
Ghostking's Weapon/Armor/Accessories Drop Rate is ?% Epic, ?% Legendary, 47% Unique, 1% Artifact
Technically 1% chance per loot roll for Artifacts.
But the lich rolls this drop table 3 times.
So overall the Ghostking has approximately 3% chance to drop an Artifact per kill.

Abyss Bosses (Wyvern)
Lich's Weapon/Armor/Utilities Drop Rate is ?% Epic, ?% Legendary, 41.5% Unique, 0.75% Artifact
Different bosses may have different amounts of artifacts relative to total items on the table. Currently each "Hell" boss has 5 Artifacts in their respective loot table.
Technically 0.75% chance per loot roll for Artifacts.
But the Frost Wyvern rolls this drop table 3 times.
So overall the Frost Wyvern has approximately 2.25% chance to drop an Artifact per kill.

Math for "At Least One in N trials"
For the chance at an Artifact appearing after multiple trials is (1 - ((V)^N)) x 100 = C
V is chance of failure, N is number of trials - aka, how many times you "hit" or roll the event, and C is your answer in percentage format of getting 1 or more Artifacts

You can also write V as (1 - P), P being the probability of the event happening (1 - ((1-P)^N)) x 100 = C

What the formula is doing is taking your chance of not getting an artifact x times in a row and subtracting it from 100%, this formula does NOT calculate your chance of getting 1 artifact, it calculates your chance of getting 1 OR MORE artifacts

Example
(1 - ((1055/1075)^15)) x 100 = C is the formula for 15 runs at the mystic gem room,
After 15 tries you chance of getting 1 or more Artifacts from the room would be 24.55%.

15 runs of skull key would be (1 - ((410/430)^15)) x 100 = C
51.052% of getting one or more Artifacts

15 runs of Lich would be (1 - ((10591/10600)^15)) x 100 = C

1.266% of getting one or more Artifacts

Math for "R in N trials"
(N! / R! (N-R)!) * (P^R) * ((1-P)^(N-R)) * 100

The probably of getting a SPECIFIC number of artifacts R (number of artifacts)
in N trials with
P as the probability

Example
Getting exactly 2 artifacts from the gem room in 18 trials would be

(18! / 2! (18-2)!) * ((20/1075) ^ 2) * ((1055/1075)^16) * 100 = 3.921%