It's called the Metaverse, and it's a place born from unconscious thoughts. Inside that place, we have things called Palaces, which are created by negative and corrupt thoughts. Basically just feelings that warp the perceptions of people into being a hazard for themselves and others.

[ He looks downward for a couple of seconds. ]

A Persona is created by a powerful swell of emotion... It's the spirit of rebellion that takes form into something that can use abilities. [ a beat ] For instance, I have a Persona named Satan that can use bufu skills - ah... ice spells.

[ Then, after a soft hum, he starts listing some from off the top of his head. ]

Arsene, Jack Frost, Flauros, Gabriel, Beelzebub, Mara...

[ why are we including Mara tho ]