The whisperer

Could someone help me what spells to use etc at the whisperer while quest? Don't even come close to the enrage phase :/ i'm wearing trident of the swamp with dagonhai' barrows gloves, boots of brimstone, book of dead, seers ring(i) and occult necklace also Autocast ice burst trying for more than a hour atm... Damnn this Boss is hard, constant changing prayers while eating potting and avoiding those things specials in between it seems just to much for me 😮‍💨 thought Leviathan was already hard 😅 120hp left and i have 0 insanity or ran out of food, Lack of skills i guess :/ no room for mistakes 😤 this quest and nightmare zone are my last 2 quests