It is a crossover series between Video Game Sonic Universe and Archie Sonic Universe
Following the events of Forces, the worlds of Beryllia (games canon) and Mobius (pre-reboot Archie) collide. Sonic the Hedgehog, Sally Acorn, and a wide cast of supporting characters are left to pick up the pieces.
Cosmic Collapse can be found at
A03 Link - 
This series is spread across multiple books
Quantum Satis is Book 1 of the Series
Cosmic Collapse contains examples of the following tropes:
- Action Girl: Nearly every major female character classifies as this.
- Alternate Universe: Mobius Prime, the planet that Sally and her friends come from is shown to be from a completely different dimension than Beryllia.
- Apocalypse How:
- Both Planet Mobius and Planet Moebius went through a Class X apocalypse due to an unknown event. Which lead to the inhabitants of both planets being sent to Beryllia via falling to the planet from space.
- * The Big Race: The Extreme Gear Racing Competition on Earth
- Dream Land: Infinite creates a illusionary world trapping hundreds of people inside of their dreams.
- Floating Continent: Angel Island
- Ghost Invasion: An invasion of what seems to be deadly phantoms has attacked several cities. Causing the civilians of Beryllia to be paranoid and on high alert
- La Résistance: The Resistance, The Freedom Fighters
- Mind-Control Device: Eggman Nega's camera allows Rouge to other people inside of cards. And then use those cards to mind control them.
- The Multiverse: The multiverse is shown to be very large with Sally and her friends coming from the 13th Dimension while the planet she is currently on is in the 1st Dimension