User blog comment:The Inceptionist/A Multiplayer DLC Idea/@comment-3258762-20120730221252/@comment-1683278-20120730225059

I would usually agree about the Sentinel being a tank, but the vorcha are very powerful in their own sense, which is why I put it there. And about the mercenary thing, I all wanted them to belong to one of the three main merc groups, so that is why the vorcha is Blood Pack.