He challenges you in the ways of old which translates to:
"Im calling your ass out, I challenge you, but first, let me send out all my minions and a robo-spider to kill you and I'll just keep running away when you hurt me too much.
Oh...there's no more places to run an- .....thats a nice gjallarhorn you have there....."
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To be fair, you better be careful in those hallways cause dude hits like a truck. When my team got to the last room we hit him with rockets and he ported to the back of the room. I chased him and hit him with 3 more. He melted and never even summoned the adds.