Large Dragon Bone
A summoning item, you can call a raid monster at a certain location in the Dragon Valley. But if the raid monster has already been summoned, it cannot be called.
Batwing Drake84 lvl1Emerald Drake82 lvl1Giant Scorpion Bones83 lvl1Hard Scorpion Bones83 lvl1Dragon Tracker of the Valley83 lvl1Dust Dragon Tracker84 lvl1Sand Drake Tracker83 lvl1Drakos Hunter83 lvl1Dragon Scout of the Valley83 lvl1Drakos Guardian84 lvl1Drakos Warrior83 lvl1Drakos Assassin83 lvl1Scorpion Bones83 lvl1Parasitic Leech83 lvl1Hungry Parasitic Leech82 lvl1Gem Dragon83 lvl1
Cannot be spoiled.
The chances are official (x1). On servers with x10, x100 and higher rates, drop and spoil come more often.