Skyrim talk:Dwarven Armored Mudcrab (creature)
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The Dwarven Armored Mudcrab will throw down with the Heretics from the "Ghosts of Tribunal" CC quest if you take him in to their temple, as well. So much so that he was ahead of me already fighting everyone after I passed the first two guards.
I mean, think of how aggressive the normal mudcrabs are, even the little tiny ones - and then give one of them a full set of armor and make him immortal, too? Not to mention the set of knives his owner may have given him for extra "protection".