Dragon Studies

Welcome! It's been a long time since we last saw each other... Could I ask you for a favor? Our priest has given me a difficult task, and I don't have any time at all. He captured a young dragon, but he can't seem to tame it. Everyone knows how difficult that is. Even keeping a dragon in captivity is no easy task. The priest hinted that his pet loves green orbs. They say some dragons swallow them and keep them in their bellies. Can you kill several young dragons and obtain green orbs?