My Goodness, I can't believe I didn't think of this sooner.

Whichever expansion brings you to Alamigo. As a part of the story, you fight the former leader of the Corpse Brigade, on your own. This fight opens up a Trail where now you get to fight him four or eight on one, as opposed to just one on one. At the start of the fight, This man pulls an Iceheart and embodies a Primal. But he doesn't just embody ANY Primal, he embodies an Elder Primal, Belias.

Ladies and Gentlemen, Wiegraf Folles.