His Long Awaited 2018 Heel Run
Ambrose was out injured for a large portion of 2018 (requiring two surgeries and later carrying an MRSA staph infection) and returned looking rejuvenated the week before SummerSlam 2018, aligning with Seth Rollins. However, It did not take him long to turn on Seth.
Many fans were excited for a heel turn due to his impressive displays as John Moxley during his time on the independent scene. It seemed like a welcome breath of fresh air, having exclusively worked as a face since the Shield first disbanded.
The heel run was officially doomed after his antics become unnecessary - a good example would be him receiving a needle in his backside, in what was an absolutely moronic segment. Ambrose was slipping back into his comedic persona.
Ambrose's departure was handled cordially by both sides, but WWE are likely sour - the Lunatic Fringe did lose matches to Corbin, Elias, McIntyre and EC3 on the Road to WrestleMania, and was not even a part of the biggest show of the year. Ambrose is still young and a valuable asset to any wrestling promotion. It remains to be be seen what the future holds for The Lunatic Fringe.