We live to die, and die to live again.
This Cycle continues, neither to Begin nor End.
Ever Beginning, never to End, we come to the story of our Unusual Friend.
The Gods are as varied and unique as the mortals that worship them. Some are kind, others are fluffy, and (given the nature of the multiverse) a few are Eldrich Abominations of Unspeakable Horror. But that's fine, those few tend to mind their own business...
At least until an Eldrich Abomination (an interdimensional cosmic slime-mold specifically) gets itself devoured by a Lich during a ritual to obtain Godhood...
Especially because anyone, even a Lich, who's willing to eat an ENTIRE COSMIC SLIME-MOLD for any reason, even godhood, is undoubtedly a madman...who's now set his unsightly gaze upon replacing (likely by devouring) the Godess of Magic herself!
She could probably use some help...if only to avoid touching the slimy Lichgod directly.
Also, the Eldrich Gods are protesting these events in their usual manner...by trying to destroy all of Creation.