There are a lot of places that the damage from a spell is calculated, along with several modifiers in different scripts. However, a good starting place is the Damage method of SpellHelper.cs.
 
You need to find this code and modify.

SpellHelper.Damage( ~~~ )
[ Each of spell scripts use this code to deal damages to target ]

and this function return to AOS.Damage( ~~~ )
 
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