Remember the Extra about the Sunlight Chamber?
If you did it, and the Sunlight Chamber is equipped to Thunder Lance, then have fun doing the following: Attack x3->Thunder Lance->Lightning Tempest Repeat. If not: Attack x3-> Thunder Lance Repeat 4 times. Then Lightning Tempest. If the Two Handed Master uses Overlimit, or any of the other enemies in the later rounds, run around until then run out of their OL Form. You can see by whether or not the aura around them is there or not. Cook Stew if you ever need to.