No. 3 - Sotetseg
Sotetseg is a relatively straightforward fight as well, but its unique maze mechanic is why I have it listed one spot higher than Xarpus. That, plus the fact that it does actually attack you.
Sotetseg launches both Magic attacks and Ranged attacks, both of which can be prayed against, as well as a large red ball that you will have to tank. Twice during the fight, Sotetseg will “choose” you and send you to another realm, where you will need to follow the path shown on the screen and do so quickly enough to remain ahead of the chasing tornado.
Don’t try to take shortcuts; be calm, cool, collected, and calculated. When you return to the regular realm, be careful not to stand on the corresponding platform until the fight actually resumes, or you will take massive damage.
Rinse and repeat until the fight ends.