I was going through some old doodles to post and remembered about this one! When consuming mages or magical creatures, he usually has to use up the extra mana one way or another What happens is that crystals of pure mana grow out of his back and can be reused later as a mana battery by eating it

In the case of endo, you will be coughed up but may feel weak with most of the mana drained from ya Whoops