Kaelis, and others - I would be careful. An infernal is the child of a succubus or erinyes and a god. They share with the many evil planars many powers; they can command many evil powers, including the power of a minor sun, and are immune to most things you could throw at them - including any of your spells after the first. Their most dangerous secret, however, lies many thousands of years ago, in the distant past. In the very beginning, the Primogenitor, the essence of Law, banned the powerful castes of the lower planes from leaving their homes. Infernals, however, are half-god; they can roam. And this one has.

Another spell is 'loaded'.

Spoiler
Show
This time, it's metamagic item:admixed spell (cold). Also extended.