Quote Originally Posted by Joseph Silver View Post
It's one monster, albeit a much higher-level one. Use all your dailies on it and you should win.
This. 4E is surprisingly forgiving.

You've got three ranged strikers, you should have some damage on it before it notices you're there, and it really isn't all that difficult to take it down rapidly with your group. And you've got a cleric too to patch ya'll up, so just don't get one shot.

Oh, and asking for advice is not metagaming.