Lava eel

Lava eels require level 53 fishing and is used in the Heroes' Quest, and a cooking level of 53 to cook. When consumed, lava eels will restore 110 of a player's life points. Lava eels may be caught, using an oily fishing rod and bait, in the lava rivers found in Taverley Dungeon or in the Wilderness Lava Maze.

Players who wish to reside in the dungeon for extensive periods can bring equipment (logs, tinderbox, oily fishing rod and bait) to fish and cook the lava eels to produce food for combat. This is especially true for players given Black Demons or Blue Dragons as a slayer task.

During the Heroes Quest, guild-master Achetties will ask players to obtain a cooked lava eel to prove that they are worthy of membership to the Heroes' Guild. Players will then need to visit Gerrant in Port Sarim, to learn how to make an oily fishing rod, followed by either Taverley Dungeon or the Wilderness Lava Maze to catch an eel.

Lava eels are also used to get the fire keeper at Death Plateau to tend the fire in All Fired Up (minigame).

Trivia

 * Oddly, you can cook the lava eel on fire. In real life, lava is much hotter than a simple campfire. This is also stated in the examine information.
 * There is currently a glitch making the fishing spots for fishing lava eels floating far above the actual lava.