FAZtastic (Nsfw dni).

"After a cosmic apocalypse, a lone alien mind escaped to the ruined Mobius, jumpstarting the corpse of Knuckles. Now, he's an emotionless alien trapped in a decaying vessel, who endlessly drags himself toward the sun's horizon, forever searching for answers in a dead world."

His old design. (2/2) 🧵

The fight also happens alongside the events of chapter 5 when the fountain opens, explaining how Mew Mew got the shadow crystal, which was made from Sylvester's broken dream to protect everyone. He's also named after the cat in Looney tunes and was inspired by Pete N VB heavily.

More info: Sylvester is still alive and sees everything Caller does, but can't do anything because his soul became one with the Caller due to the strong emotion of grief, like the Dummy on the genocide route of Undertale. After his and Caller's death, he becomes a goner (2/2).