You don't know that for sure. He could have 7hp for all you know. Hit him with the worm then take out your wand and summon some motherfucking badgers! With all that armor his touch ac is probably very low, and your land speed might be higher so you can run around and he won't be able to hit you. Unless he charges, but you can stop that by putting a badger between him and you. Or you could put on some knee pads and start apologizing, until the rest of us get through the portal, your choice.