How fortunate that you have each other, then.

[There's a tinge of envy in his voice. At least if Joker were here, he'd have someone he could trust with his purest, messiest self.

Alas.]

To answer your question, this 'Arcane' is not something of my world. The closest we have to magic resides in a parallel world born of humanity's collective cognition and the pockets of distortion that individual humans manifest.