Glasses

Wire-framed spectacles that trade -1 HP for +2 Intelligence. A fair deal for INT-focused builds — the stat boost is substantial and permanent, while losing one max HP is a manageable cost on most cats. One of the few uncommon trinkets that directly improves spellcasting and ability scaling with a real but minor downside.

Compare to Human Brain (+2 INT, no cost) — if you have access to both, Human Brain is strictly better. Glasses is the more commonly available option when Human Brain hasn't dropped. On high-HP cats, -1 max HP is negligible and the +2 INT is worth taking. On low-HP fragile builds, that one HP can represent a meaningful fraction of your total health pool.

Best on Mage builds or support cats where Intelligence directly improves effectiveness. Stacks with Mark IV (permanent INT gain per four casts) — starting with +2 INT from Glasses means every Mark IV proc is adding onto a higher base. On fighters or physical-focused cats who rarely cast spells, the +2 INT has less impact and the -1 HP is simply a loss.