The Hydra is a boss mob of the Twilight Forest. It inhabits the Hydra Lair in the Swamp or Fire Swamp. The monster begins the battle with three heads, which can attack with fire breath or exploding fireballs. The only time the heads are vulnerable is when the mouth is open wide, about to attack. After a Hydra head is killed, the beast will grow two more in its place, the maximum amount possible being seven. The Hydra drops Fiery Blood, which can be used to craft Fiery Ingots, as well as a decorative Hydra Trophy.