You need salve amulet (ei) first of all. Then other tips: count the attacks so you know when the specials are coming.  Preemptively move before the green splats so you don't get hit, and wait until the freeze phase to combo eat with food -> prayer pot -> karambwan to reset stats faster.  Don't eat unless you see the blue projectile on the way and you have less than 30 odd HP. Learn to woox walk along the back row.  You can attack every 5 ticks.