"I remember annihilating the entire Undead Dragon Legion he had during the besiegement of Bertlein! How does he still have so many undead dragons?"
"Our Metallic Dragon Clan alone was slaughtered by thousands by Bertlein. It was much the same for the Gem Dragon Clan. Otherwise, why do you think the Dragon God and Dragon King were so furious?"
"That means, he probably still has around two thousand dragon corpses!"
"This bastard needs to die!"
"We can't kill him, only seal him. Remember, can't let him self-destruct."
"Right, after the seal is successful, I'm negotiating with the devils of hell to acquire a way to torment his soul."
"Count me in. He refined several of my descendants into bone dragons."
"Same here!"
"Should we initiate the spatial seal now?"
"No need, let's wait for him to release all of the undead dragons. I want to shatter all of them as they're an abomination to our Dragon Race, and then take them back. We can't leave them in his hands."