Board Thread:Help Desk/@comment-7860774-20130407012806/@comment-26952072-20150908135942

Ah yes, potions. You definitely need the ironskin potion. Building the large bridge is such a pain but yeah it's worth it. Just don't be like me the first time I fought it and overprepare. I covered the entire hell with a bridge (small world, but still a ridiculously time consuming task) and then defeated it only about 1/4 of the way down my bridge.

It's much better to build a smaller bridge and use all "Menacing" accessories, lots of buffs (like the cooked fish and many potions), and lots of focus. I tested the damage output, with the Molten armor, the Molten Fury, and Hellfire Arrows and it's still really good. And the Necro Armor really doesn't conserve enough ammo to make it worth using (also tested that) so just stock up on ammo and you'll be fine. There's no reason to avoid using the Ammo Box, unless your Traveling Merchant just never has one.