Obsession

When you think of Mobius, you think of a peaceful Planet where both humans and Mobians live together in peace.

Well that's what Mobius used to be like before the a power entity manages to escapes from being sealed away within the Master Emerald.

The planet had fallen into ruin cause without the Chaos Emeralds no one was stronger enough to take on this entity. Just keep his friends safe and to at least give Mobius some hope Sonic sacrifice himself to become this entity's bride.