Jitte

The Jitte is part of the Ninja item set and deals damage equal to half your cat's Strength, rounded up — not flat damage, but a stat-scaling hit that grows stronger as you do. Every successful swing inflicts Weakness 1 on the target (reducing their damage output) while simultaneously granting the attacker +1 Strength and +1 HP. In a prolonged fight, the attacker gets meaningfully stronger with every exchange while the target gets meaningfully weaker — a compounding feedback loop that rewards staying in melee.

One quirky interaction: if your ally Pyrophina is on the field and no enemies remain, you can swing the Jitte at her to pocket the +1 Strength and +1 HP without spending them on an enemy encounter — a niche but real way to pad stats between waves. The weapon is a nod to Umezawa's Jitte from Magic: The Gathering, which shares the same philosophy of simultaneously strengthening yourself while debuffing opponents.

Scales best on builds that already invest in Strength, since both the damage formula and the stat gains compound over time. On a Ninja set build with other set pieces, the per-swing Strength growth over a long run can produce substantial damage scaling. The Weakness debuff is also a durable defensive benefit — high-damage enemies who get hit repeatedly become progressively less threatening.