Besides bein' super convenient, your crystal protects you.

[He tugs on the chain of his own, presumably a pendant on the end of a necklace. "Presumably," because he doesn't actually pull it out from under his coat.]

You see how your emotions manifest in the world with all those effects, yeah? That's 'cause the world is absorbin' your emotions for itself. Seems this whole place got real drained sometime in the past. But as long as you have your crystal on you, it acts as a buffer so it doesn't suck you dry, see?

[Nothing to worry about!! Probably.]