today i find some time to do few small tests with new dmg multipliers and i cannot figure out whats the formula behind it

0.5 multiplier :
medium spitter 930dmg from single attack
big spitter 1410dmg from single attack
big biter dmg to walls 21 from explosion after death

0.1 multiplier:
medium spitter 38 dmg from single attack
big spitter 57 dmg from single attack
big biter something around 11dmg to walls (i lost screenshot)

didn't test behemot spitters cause i don't have entity what can survive single attack at 0.5mp

so why this numbers so unlogic and not linear? when i set it to 0.1 just to see what happen i expext to get 1/5 of damage but not this.

The problem is that we have 2 effects applyed in this mod. The spit itself, and the fire it spreads. I myself dont know exactly how factiorio haldles this.
In code, for example, the medium spitter has a damage_modifier=2DAMAGE_S, where DAMAGE_S is the mod setting. But the spit alse creates fire with this code
fire.damage_per_tick = {amount = 2DAMAGE_S, type = "fire"},
So, thats is complicated...