(Warning Novel Long*
Erebus used to have a prank buddy. Him and them were a force to be reckoned with, anyone who crossed their path was subsequently dunked on, and their combined powers were enough to even to fake the end of the world, floor is lava, meteors ect... if they wished it to.
One day after a big prank, Erebus walked around looking at the false destruction they caused. 'This Illusion spell sure is lasting a long time,' he thought. He then stumbled upon another god laying on the ground out cold. He prodded them and waited for the god to awaken so he could mock them but they never did. It slowly dawned on Erebus that everything was not an Illusion spell and had, in fact, happened.
A deep horror filled him. Did he make everyone think everyone was gonna die? Yes, but he never took it this far. Not like his prank buddy did. He could not look at them the same way anymore, that same terror he felt that day filled him every time they showed up. One day he told them he was gonna take a 5 year nap, normal for most gods, and they wished him goodnight.
He had many nightmares of them making it nigh impossible to sleep. Sometime later, a god woke him up and took him into questioning. His prank buddy was being charged with some really bad things and they planned to use him as their alibi. However, when the gods asked if Erebus knew his prank buddy he said he didn't know them. He really didn't anymore. They were sentenced to a dimension where they would never be found again.
Though unhurt by them, the damage caused to his mind left him unable to trust other gods and the occasional fear they'll might escape to get revenge for his 'betrayal.'
*Please don't make a headcannon about Cashmere's parents*