wth i did it in 1 go. i even used my porcupine cause i forgot to bring my frostner. i used 1 fire potion and 1 stamina and bonemass power. i killed the boss in ~5min bonemass power was just running out. i ate 1 serpent stew, 1 lox pie and 1 blood pudding. didnt even bothered to dodge the meteors just stick to him and hit him, pause sometimes for stamina.
remember to clear the area of mosquitos and fulings before starting. also was wearing my lvl 4 paddad full armor with cape.
check the video on valheim wiki. it was the easiest boss.
the porcupine was almost spent but it lastest.