Here we have a clean code to change the chance of falling dn-ds I know that many search for this code until today! Good use.
Common / service.h
Game/src / item_addon.cpp
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int iSkillBonus = MINMAX(-30, (int) (gauss_random(0, 5) + 0.5f), 30);
int iNormalHitBonus = 0;
if...