I walk in he stomp me and stuns me, and then i ca no longer do anything until he stomps and then kills me. does he stop spamming those attacks after 2-3 and I just need to pump up my stats or something?

Out of the levels you've alrready done how many of the stat points have you got? (get them for doing different tasks within each mission)

If you have used the middle talent tree you also get the ability to make yourself invulnerable which is vital for surviving massive damage or multiple heroes at one time.

Not working out thats for sure.

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Oh, all you gotta do is not stand still, essentially. He only does that attack thing every couple seconds. was pretty easy after finding that out.

Try using the minion summoning spell to distract him.