This was the most difficult challenge I've faced in OSRS. Redemption is necessary for this. I calculated each of the redemptions and it seems you should use it 5 times out of the 8 big hits you take. It doesn't matter which hits you use redemption for as long as its not the first one since you start with full prayer points (redemption uses up your remaining prayer).

Taking 2 sips of prayer pot after each redemption will be enough to last until the next big hit. I don't think I even had to flick mystic might because I had plenty of prayer left over by the time the big hit came.

Stats:
-85 Hitpoints
-77 Defence
-70 Prayer
-83 Magic


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