Abaddon.
Seven feet tall. Three feet wide. A rather large sword of pure energy appears in his hands, and whatever he hits gets touched by Death and Flare.
http://media.comicvine.com/uploads/5/50273...rrior_large.jpg

Azrael.
5’ tall. Fights with an energy Lance. Same effect as Abaddon’s weapon.
http://farm4.staticflickr.com/3396/3260237697_9f62127233.jpg

Both stay hidden under black cloaks until it’s time to fight, when their wings pop out. And the cloaks fly off. Cause it's awesome.

Not NPCs as much as incarnations of the Death and Flare spells. Can be "killed" with anything that would dispel or stop Jerrick's energy flow to them, though he could just bring em right back if the effect isn't maintained. Since he can cast the spells without cost, getting into a cast-dispel fight with him isn't smart.