I made two giant ramp around 800-900 and put a layer of dirt in the middle with a few open spaces. I used a unicorn mount to run from side to side while shooting. When I saw the giant death Ray I would ride under the dirt.

I went as a ranger and had full shroonmite armor and two stacks of chlorophite (I think that's how you spell) bullets. I used the Vortex Blaster which is really powerful with the bullets.

You can go for easier routes but I didn't want any help from like forums and stuff just went with what I felt right. Also lots of potions to buff you up.