mmm im a noob to the game but i already killed the swamp boss... tip for the elder mate... dig down near the alter preferably down a little and a little cave under the alter so you can get hp regen from a fire and repair from a bench... the boss will move in view of you but wont beable to attack though the tenticles might spawn in the hole youve dug u should have enough time to recover hp if not a single fire arrow on a good bow will kill it... goodluck mate