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.

In the anime, it was first used by Omega-Xis to destroy a large asteroid as a cover to escape, as Omega-Xis hid it inside his own body. It was retrieved by Cygnus Wing when Omega-Xis revealed the location, due to Cygnus Wing threatening to kill Geo, who was redered unconscious from being defeated by the other FM-ians. It seems that anyone that holds the Andromeda Key has total control over Andromeda. Cygnus Wing planned to destroy Earth with Andromeda, along with the other FM-ians, so that he could receive all the credit from Cepheus. However, Gemini Spark came and wounded Cygnus Wing with their Gemini Thunder from behind, so that they could take the Andromeda Key. Gemini Spark intended to use Andromeda to conquer Planet FM and overthrow Cepheus. When Mega Man defeated the other FM-ians, he used the Atmic Blazer attack as Fire Leo to defeat the leftover FM-ians, Gemini Spark, and Cygnus Wing. The latter ended up losing Wave form and Cygnus being destroyed. After that, Mega Man took the Andromeda Key and damaged it into expelling all the negative energy from it, thus shutting down Andromeda.

However, Pat found the Key and then made a duplicate and gave that to the FM-ians. He told Cancer that the Key can be refilled with the negative emotions of humans, which instigated the FM-ians a series of attacks for awhile. However, the humans negative emotions were too weak to refill the Andromeda Key at all, causing Gemini Spark to slowly get impatient. After Cepheus ordered the FM-ians to return home, Gemini took drastic measure to refill the key. He went on and slaughtered Taurus, Wolf, Ophiucus, Libra, and Crown, and absorbed all their negative emotions, which produced a much greater quantity than humans. It wasn't fullly charged, but there was enough to reactivate Andromeda. After Andromeda is destroyed, or more critically damaged, Gemini White decided to destroy his Black counterpart, thus completing the Andromeda the Key.

The completed Key then healed Andromeda to the point that it was never damaged to begin with. At full power, Andromeda drills into the planet's core and releases a large amount of negative energy, which would cause the planet's core to self-destruct. Mega Man knew the only way to stop Andromeda was to get the Key, which Gemini White had, and he left the planet to escape it's imminent destruction. Mega Man catches Gemini White, but he throws the Key back to Earth, resulting in Mega Man chasing after it. Mega Man grabs it with Omega-Xis and shatters it completely, permanently destroying the Andromeda Key, and therefore Andromeda itself.