Every tanar'ri Haltro ever faced was a cruel manifestation of pure and erratic evil. Except a peculiar vrock, named Hieronymus. It seems like that creature was in some kind of debt to a powerful demonic entity, that took liking to the sorcerer, but along the strange way out of the Abyss, he was nothing but a helpful companion and a cheerful trickster. Only after the heated battle, when Hieronymus was manifesting his true nature, Haltro could grasp the destructive force that vrock wielded. But when the putrid clouds settle down and dissonant screeches die out, this tanar'ri once again donned the visage of a cheerful magpie. Forever cementing in aasimar's mind the concept, that you should never trust the will of the Abyss incarnated.