Pack of Blades

A neck armor (listed as trinket in CMS) that stacks +1 Serrated Claws every time you backstab an enemy. Serrated Claws is a unique status effect — the only item in the game that grants it. Backstabbing requires attacking from behind, so this rewards positioning-focused play. As Serrated Claws accumulates over multiple backstabs, each hit becomes increasingly punishing.

Serrated Claws applies a stacking bonus to melee damage. There's no cap mentioned in the data, which means a run with many enemies and consistent backstab positioning can accumulate very high stacks. The Thief class and cats with mobility abilities that allow repositioning behind enemies will rack up stacks fastest.

Best paired with the Prowler's set (Cap, Mask, Vial) that also rewards backstabs with crit chance. A full Prowler's build backstabbing with Pack of Blades equipped stacks Serrated Claws while also crit-fishing, creating a melee damage ceiling that grows with every fight. Any ability that repositions you behind an enemy — dash, teleport, or knockback inversion — feeds the Pack of Blades directly.