Eclipse is a shadow demon spawn created by Nox. She lives to serve him, and was created to watch A.B. to keep him in line, and to cause chaos on the Train and destroy people's relationships. She has memory wiping abilities and can teleport around the Train, but naturally she keeps these abilities a secret from the residents.

She is the newest member of the Train, and disguises herself as a human to hide amongst the Train's residents.

♫ Spider Dance - Toby Fox