Shattering Stars/White Mage

You have to survive 5 minutes, heal 5,000HP or reduce Maat to a low enough HP to be proclaimed the victor.
I would suggest -%Physical damage(Earth Staff), def food, and as much DEF gear or artifact as you currently have. This is possible without a ton of gear.
Depending on your race, you may want to bring MP consumables. As a taru, I was able to just squeeze out a victory without meds.
I used CureII mostly and CureIII when needed, cast flash/stoneskin while he cast Banishga III and kept Regen3 up.