A nice guide. Brief and complete. All I would add is to use zealots with attack boosting prayers; I've found this really helps, and since you take a bird skull necklace for restoring prayer between phases the negative prayer bonus of the zealots doesn't matter. I'd also recommend the AOE melee thresholds for the minions over chain and dragon breath; they're slightly more reliable for it, but as you say you can easily make do with the mage basic abilities if you would rather use the inventory slots for more supplies.
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