another one of my theories is that monsters can channel their magic through their body and even gather it up in one spot to focus it and make it more powerful, like with sans's flashing eye

Description: full name: sans comic skeleton full pam name: john sans classic sprite sheet made by spectator/scott the watcher (thank you its so good) (some sprites were put together by me, like the fire engulfed sprites, and i did edit some sprites to be more dynamic, but mostly all credit goes to scott.)