I have full nebula armor, the magic cuffs ,destroyer emblem (i cant get the sorcerer emblem), Mana flower and the Master Ninja Gear. My weapons are Nebula Blaze, Lunar Flare and a solar eruption (for random things). I made a Duke Fishron arena with asphalt ground for speed and it is a BIG open area. Ive beaten him once with a friend but by myself I cannot beat him, ive gotten him to about 1/4th health but then i die. He is REALLY fast and I need help. I tried using the Lightning boots but that actually made it worse (I couldn't even get him down half health.