Unbound

Unbound is an unloaded keyword. It's unusual because it isn't printed on any cards: instead, all companions that are not Ring-bound are unbound.

The Ring-bearer is always Ring-bound, even if it doesn't say so on their card. (This is only relevant with the alternate Ring-bearers, first introduced in Reflections.)

Only companions are unbound. Allies and minions can never be Ring-bound or unbound.