Yagluth is devastating until you know the deal. Prep the battle field ahead of time with a raised wall between the 'fingers' Make it just high enough for you to jump over. Yag will be stuck inside. You can hide behind the wall to avoid his AoE and physical attacks. His meteors come in at an angle, if you have a trench you can duck into it. Or hide under the fingers. Watch some Youtube videos. Once you know his attack routine and how to cheese him, he's not so bad, and keeping him corraled minimizes nearby spawns entering the fray.