Yes i did it yesterday actually on my account with 15 pray.
Basically you pretty much only need help with the ice boss, you have a friend block the 5 trolls you kill and then you follow him past the wolves so that you dont take damage from them. Then you will have him stand to the left of the rock while you attack the ice boss with fire spells, he drains your stats so be sure to bring two super restores or so.
The ice boss was the most work and the hardest, the only other boss that kinda hurts is either the smoke or shadow one, i forgot which, it is the one with two forms. You will want to safe spot him in the north alcove and have a friend bring you food if you need it as he and the skeletons will hit you rather hard while youre safespotting