It's like magic, but not quite. It only works in the Metaverse--the strength of your heart is able to physically manifest there. And because your mind makes it real in a place like that, it takes a form you would personally recognize as power or strength--so it can look like a magic spell, or just like making you strong enough to actually be able to hurt Shadows with weapons--or sometimes even your bare hands! Get it?

[A beat, before he adds, a little sheepishly:]

.....Well, I guess it does work here, too. But that's because of how unstable reality is in this world.