From Dark and Darker Wiki
Fireball: Direct 20 
Fire Magical Base Damage Direct Scaling: 100% Scaling AOE 10 Fire Magical Base Damage AOE Scaling: 100% Scaling DOT 20 Fire Magical Base Damage 50% Scaling
The Dark and Darker Wiki is made by and for the players. Do you want to contribute?
From Dark and Darker Wiki
Fireball: Direct 20 Fire Magical Base Damage Direct Scaling: 100% Scaling AOE 10 Fire Magical Base Damage AOE Scaling: 100% Scaling DOT 20 Fire Magical Base Damage 50% Scaling