Spell; Due to Swapfell having Chara and Asriel swap (my game my swaps >:) ) It’s Asriels soul you borrow instead of Chara (implication of the player soul being chara’s at the end of the genocide route). This allows you to use magic and acts as a 2 in 1

Bribe; this function isn’t super relevant in the context of this fight, but what it does is replace mercy. With the world of Swapfell being built off of greed, you’re forced to give payouts and surrender items to peacefully end conflict (there are certain spells that would allow you to do this as well to prevent you from becoming soft locked from the pacifist route)

MGK meter; the MGK meter signifies your stored magic, being required for spells and such. Each round the MGK meter increases by one notch, with a deltarune style “defend” being an option as well

(UPDATE) The fight button will soon be turned into the “Stance” button, allowing you to either assume a combat position and strike your foe, or assume a defensive position and reduce damage.