Ok so lets just say that a mob has a certain drop chance to drop a mask. Once you equip that mask, the enemy you got that mask from does less dmg(lets just say well…15% for spider).
This would also be an entirely new equip slot
Although the negative is just the high chance of most likely everyone in an area wearing the mask so uh… perhaps it could have the option of being hidden.
also lowkey it doesn't exactly have to be a mask