Keys
Account-bound permanent upgrades scattered across the library — each one gives a stat boost some gamepasses also grant.
Azure Star
Permanent +2 carry capacity — stacks on top of Golden Diamond.
Crimson Octagon
Permanent jump-height boost — the free version of the Max Jump gamepass.
Emerald Club
Permanent sprint-speed boost — the free version of the Max Speed gamepass.
Golden Diamond
Permanent +3 carry capacity — no gamepass equivalent, so this one is must-grab.