Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods It doesn't seem possible to use a deltamod to lower primary damage from the receiving item?

If i try to add a deltamod for a bow :

new deltamod "PiercingBoostBow"
prefixname ""
suffixname ""
param "ModifierType" "Weapon"
param "MinLevel" "1"
param "BoostType" "ItemCombo"
new boost "_Bow_Piercing_WeaponBoost",1



and this is the boost (stored in one of the files holding items there)
new entry "_Bow_Piercing_WeaponBoost"
type "Weapon"
using "_BOOSTS_Weapon"
data "Damage Type" "Piercing"
data "DamageBoost" "-50"



It does not actually lower the damage of the primary (piercing) type.
However if i remove the minus, it adds up 50% bonus no problem. This means it isn't a problem in ItemCombos.txt.

This is irritating because i wanted to make a deltamod to 'divide' a ranged weapon pure primary damage into piercing and crushing, but this wasn't able to swing it.

Am i doing something wrong? Is there a minimum damage on the primary damage stat of each item you can't go under? And besides that, what's the difference between DamageFromBase and DamageBoost? Neither seems to work in this case mind you.