Most badass enemy?

We all loved Rotscale and Maw the Mountain Heart, Tyria's largest monsters. What's the hardest Canthan boss you encountered so far?

For me, that would be an elementalist Kappa boss, with a name along the lines of "Warcrest", using Shatterstone elite. That bastard single-handely... err, single pawendly wiped my entire henchie team. 5 times. Granted Sister Tai handled the healing, but still.

He can be found deep in Rhea's Crater, patrolling the route between the two southern outposts. You can easily find his route following a track of dead outcasts. He spams spells like no monster I've ever seen before, fun stuff like AoE that hits you for 150+ damage and stuff. Also, under Aura of Restoration and Turtle Shell he's barely scratcheable.

I only managed to kill him teaming up with an Outcast mesmer boss in the area, who kindly degenned the hell out of that thing before he too got spiked to death.

Scary turtle thing. If you're not on an ele counter build, avoid.