Andromeda Key

The Andromeda Key (アンドロメダのカギ) was under the possession of Omega-Xis in the first Mega Man Star Force game. In the games, it looks like a glowing key with a red gem.

The anime's depiction of the Andromeda Key is an orb with a claw on it. It is used by the FM-ian to activate the Andromeda in episode 29.

Also it was depicted in halo 3 and reach as you can see Grave Mind within the orb.