In addition to exterminating terrible monsters, you can even fish in lava in the Hell biome. In this guide for Terraria, we will tell you what fishing rod you need for this and what rewards you can get.
First, you need to get the Hotline Fishing Hook or the Lavaproof Fishing Hook accessory. The first is a fishing tool with 45% power (the second strongest fishing rod). To obtain the Hotline Fishing Hook, you need to complete 25 quests for the Angler in Hardmode, and then with a chance of about 0.75%, you can get the tool as a reward in the following quests.
The Lavaproof Fishing Hook allows you to fish in lava with any fishing rod and bait. However, the item only drops from Obsidian Crates or Hellstone Crates, which can only be fished out of lava.
You can find lava by digging the dungeon to the very depths