Because you questioned (might have been the alcohol) the MP pool of a 66 Galka WHM facing Maat. It took two failures to rethink the strategy but here it be. What it do?
Edit: Yes, you can question the Hi Potion usage but I only used them to dump from inventory. They were cheaper than regular Hi-Pots. I ended the fight with 850 HP and 315 MP. (God Bless Vile Elixirs)