This is not Delrom's first summoning rodeo. He was summoned once before into ScapeRune - a twisted, upside-down version of RuneScape.
To his dismay, he was the subject of a quest called 'Demon Lover'. Let's just say that the only demon rings were the ones that adventurers wanted to put on his finger.
In the end, he managed to unsummon himself by wielding Darklight and saying the magical phrase Reba Melrac Muhtniremac Odnibag Iahcrup. It was a close call.