you won't be able to do it solo your first try.
bring a friend for support.
you must first have EEO on before you enter. invis yourself before you enter, and as soon as possible, HONOR Dread Horn. at this point he should already be on his way after you. start to cast Curse Weapon, and Concentrate, and spam LS. it might get a little hairy for a moment, the trick is to not fall back and keep your Stamina up.