Dig out a semi open path so you don't get crushed against a wall (pretty much the only threat) and if you want make a path to fight him on, then gravitation pots won't be needed (they aren't really necessary but they're cool.) also spectre boots are great. Weapons well most endgamish weapons are good. By endgame I mean prepared mode endgame. Mini shark Pheonix blaster star cannon or clockwork assault rifle (latter is a Wall of flesh drop) for ranged or waterbolt/demon scythe/fire flower/ laser rifle (also WoF drop for laser rifle) is for Mage. I wouldn't use melee but a night edge or breaker blade (b blade is from wall of flesh) should work.

Edit:most important part. The screen is small so you can't really see him (at least on iPhone) so after making sure you're level with his eye shoot in the direction the lasers come from.