Amulet of the Cornered Rat

Cornered Fury. When two or more hostile creatures are within melee range of you, gain a +1d4 bonus to melee weapon attack and damage rolls; moreover, you also critically hit on a "1" on the D20 die when surrounded.

This crude amulet, fashioned from a chipped bone and a length of twine, depicts a snarling rat backed into a corner. It radiates a faint aura of desperation and defiance. Rogues and street fighters favor this trinket, believing it embodies the ferocity of a creature fighting for its life.