BioAfter Frisk fell into the underground she immediately met Feist and Gabriel. Feist is a inned demon who takes the form of a young boy in a red pinstripe suit. He has pointed teeth and a forked tale. he claims to be the best dealer in hell, having already collected 255 of the 666 souls he needs to become a god. Feist tries to convince Frisk to commit Genocide so he could steal all the monsters souls.
If Feist can convince someone to shake his hand, he can take over their bodies for a few hours, This does not work on ghosts, who are abstracts like him.
He litterally breaths fire at his enemies, what is their to explain?