Prayer works fine, but they use both range and melee. Their range is much more powerful. They hit higher than 10, but only on melee. Range is 10 max, and very fast (so you should pro range) It also seems to be magic based damage, but range based prayer... At least, even in decent range defense, they ripped me apart with range. It's not to hard, with prayer armour, pro-range and a super set. You also need the crystal chime, to damage the monsters. So basically, it's just like the fight against Dessous the vampire/Blood diamond guardian but with three thingamajics instead of a single boss? No, I didn't think is was. That said I was lagging appallingly and had to do it three times because the lag wouldn't let me eat... By the way, the Tortoises are great! I'm there for a slayer assignment. They have fairly low defence, barely hit you, and in 7 kills I've have 3 loads of coins (+100 each drop), a rune pick, rune warhammer and addy ore. They also drop a gnome dish (the toad leg one mentioned in the quest) in groups of threes.