Hi, I really need help! The Skeletron Prime not only does massive damage, but the most annoying thing is the one-hit-kill feature when it spins its head (spikes pop out). It used to wipe out entire server players! I have Dangerous Dao of Pow, Legendary Excalibur, Sighted Megashark, Rainbow Rod, Massive Breaker Blade, Dangerous Clockwork Assault Rifle, Hallowed Repeater and Light Disk x5, 99 Greater Healing Potion. 500 Cursed Bullets and 500 Cursed Arrows for ammo.

I also have the Starcannon w/ 100 Fallen Stars. I tried fighting it 3 times, but everytime it spins its head while maneuvering it rapidly to my location (dealing like 8500 - 10500 damage) and it gets frustrating! For the 3rd time I used a PvP/Boss Arena but it's relatively useless.

Are there any other weapons/spells/things I should get, or some kind of strategy I could use to kill it? Or some trick to avoid the Skeletron Prime's Head?

If you have any strategies or ways to fight Skeletron Prime I'd be endlessly greatful! :)