The Power Ruby is a mystic gem that belongs to the Phantom Ranger and is his source of power. If separated from it, the Phantom Ranger could disappear.

It may have healing powers; the Phantom Ranger tried to use it to revive Cassie Chan when she was petrified.

It is unknown whether the Ruby grants the Phantom Ranger's camouflage ability or his ability to exist outside of "temporal control".

Currently in possession of Phantom Ranger on Eltar.

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