i go to dennis and cast tragic missile, at whatever is left of him i suppose

Dennis

You cast Tragic Missile at (what's left of) Dennis.  The Tragic Missile does 0 points of damage, stops, looks at you, and shrugs.  "There is no greater tragedy than a grue-eater being exploded from the inside, while he is within eyeshot of a Whattaburger," says the Tragic Missile.  The Tragic Missile then puts itself back into your inventory.

Dennis, a tear forming in what's probably his eye, thanks you for your attempt at mercy, but warns you that it is too late for him.  Now that he is gone, the grue shall run wild.  "Please," Dennis begs, "find and destroy the Ur-Grue.  If you kill him, and perhaps eat him with delicious horseradish sauce, the grue menace shall disappear."  Dennis' remains then go rigid.

Exits are More Desert, Realistic Space Battles, and Whattaburger

grue's in space? fetching pimp, this poo poos gonna be the most realistic thing i eva dun