Cavern of the Crustaceans

After zoning in, he will be non-agro. Right-click and "disturb the crab" and he will spawn several 74 ^^^ Heroic mobs and he will become connable.

He's got a massive Cold AE, it didn't seem like maxing cold resists helped much. He also has an AE power drain, and a lot of hitpoints.

Slow burn is key..