How to reduce effect of the skill "Spirit Mercenary"

[Tutti]

Hello guys,
- Could someone be telling me how I can change the effect of "Spirit Mercenary".
 
#THANK YOU!

 

[evilpuncker]

battle.c

case AS_SONICBLOW:				if (sc && sc->data[SC_SOULLINK] &&					sc->data[SC_SOULLINK]->val2 == SL_ASSASIN)					ATK_ADDRATE(map_flag_gvg(src->m)?25:100); //+25% dmg on woe/+100% dmg on nonwoe

 

[Tutti]

Tanks