From Dark and Darker Wiki
Damage Types
All damage is either Physical or Magical. Both Physical and Magical are then broken into several types, including Neutral if it has no type.
Physical Types
All Physical damage is one of the following types, otherwise it is Neutral damage.
Slash
Horizontal or Vertical attacks are typically Slash, like Arming Sword's 1st and 2nd attack.
Pierce
Thrust attacks are typically Pierce, like Arming Sword's 3rd attack.
Blunt
Attacks dealt by non-sharpened weapons tend to be Blunt, like all 3 of Flanged Mace's attacks.
It is a common misconception that Cleric's Blunt Weapon Mastery applies to Blunt damage, when in reality it only applies to Maces's.
Magical Elements
All Magical damage is one of the following types, otherwise it is Neutral damage.
Fire
Wizard's Fireball, Zap, and Explosion
Water
Examples Missing
Ice
Wizard's Ice Bolt
Lightning
Wizard's Chain Lightning and Lightning Strike
Earth
Cleric's Earth Quake
Arcane
Wizard's Arcane Missiles
Light
Wizard's Light Orb does not deal any damage.
Dark
Warlock's Ray of Darkness and Bolt of Darkness
Evil
Warlock's Curse of Pain
Divine
Cleric's Holy Strike spell and Judgement skill
Air
Examples Missing
Spirit
Examples Missing
Neutral
Any Physical/Magical damage that is not in the above mentioned types is said to be either Physical Neutral or Magical Neutral. Examples of Magical Neutral damage include Crystal Sword and Staff Mastery's Magical portion, and Poisoned Weapon. Examples of Physical Neutral damage include..., but not weapon hits which deal Slash/Pierce/Blunt.
All bonuses or reductions to a specified type do not apply to other types, nor Neutral.
For example, Warlock's Antimagic perk gives 25% Magical Damage Reduction against all types but Divine, Curse, and Neutral. As such, Poisoned Weapon is not affected by it, and neither is Cleric's Holy Strike / Warlock's Curse of Pain.
Cleric's Faithfulness perk increases only Divine damage, as such, only Holy Light and Judgement are included and not Neutral damage.