Valley Trader Kitzka:
The Large Dragon Bone is an item for calling forth a powerful fragon.
There are four Dragon Vortexes within the Dragon Valley. If you use the dragon bone by them, you will summon one of the following raid monsters: the Emerald Horn, Dust Rider, Bleeding Fly, Blackdagger Wing, Shadow Summoner, Spike Slasher, Muscle Bomber.
The Large Dragon Bone can be obtained by hunting the following monsters within Dragon Valley: Drakos Guardian, Drakos Warrior, Drakos Hunter, Drakos Assasin, Giant Scorpion Bones, Hard Scorpion Bones, Scorpion Bones, Batwing Drake, Parasitic Leech, Emerald Drake, Hungry Parasitic Leech, Gem Dragon, Dragon Tracker of the Valley, Dragon Scout of the Valley, Sand Drake Tracker, Dust Dragon Tracker.
"I'll take the bone."
"Tell me about the other items."