Monster wasn't sure exactly how he found his way to Delirium's realm. He'd been thinking about her, sure-- wondering what exactly had made her so badass, to be precise. He'd seen something posted someplace about a god or something. Whatever it was, it intrigued him mostly because it seemed so similar to the way he himself could turn people's morals and attitudes inside out with the darkness.
So maybe it was just that. James had been hiding out for a few days, terrified of the destruction and spending every minute he was out fretting about whether or not his friends were okay. He'd gone under when Monster had taken over with almost no resistance, a rarity. He was simply too scared to stay out any longer. Monster, for his part, wasn't exactly deathly concerned for Delirium's health, so the only thing he could figure on when he found himself in the shifting mire of colors and ideas that was Delirium's realm was that James had something to do with it. His fear had pulled them there, somehow.
He put a hand on his hip. "Isn't this lovely," he drawled, and his words floated away in cartoon bubble letters. "I show up and there isn't so much as a welcoming committee."