Dark sort of feeds on misery. He feeds on the suffering of others. He exploits people's darkest secrets, their longings, their deepest regrets and can bind them to his will, to his carnival forever if they're not careful.
Well, there's the new kid that disappeared on Katherine but considering it's Katherine can't blame the ki. Gershom. But it could be what you're thinking and spell different words. Go home. Or the letters could not all be accurate because of what's happening to Loki. Maybe he couldn't quite put in all the right letters as it would be outing whoever is harming him.