The Lava Dragon is a mob added in "It smells like burning! (PART 2)" Update. It spawns in the Lava Biome and will drop the Lava Heart upon death, which is a powerful item used in crafting Lava Sword, Lava Spear and Lava Helmet.
In order to finish the Lava Orb quest, you must kill one of these dragons in 10 days and obtain the Lava Dragon Heart.
The Lava Dragon is very similar to the Dragon except keep in mind that the Lava Dragon can easily destroy walls (500 building damage) so certain methods will not work. Some methods to kill the lava dragon involve using a small stone as a barricade and killing the dragon by swinging through the rock.
Another method is to hit it repeatedly with a pickaxe. Do not hold a sword or spear near the dragon; you will die even if you are not attacking. When using this trick, it is best to fight next to the ocean, since there are few obstacles (besides lava monsters) and you can get water without wasting ice. As you hold attack, the dragon will slowly go towards you, so you will occasionally need to let go. You also need to stop attacking when turning around, as you will take a lot of damage if you are immediately in front of the dragon. Even with a reidite pickaxe, you should expect the fight to take a full day.
|Forest||Rabbit · Wolf · Spider · Boar · Hawk|
|Winter||Penguin · Arctic Fox · Polar Bear · Baby Mammoth · Mammoth · Baby Dragon · Dragon|
|Ocean||GMO Piranha · Kraken|
|Lava Biome||Lava Monster · Baby Lava Dragon · Lava Dragon|
|Desert||Vulture · Sandworm|
|Other||Zombie · Vampire · Crab · King Crab|