Due to Valefor's interest in the Celestial Dragons, he had moved them all to the Evernight Territory. Originally, some Celestial Dragons were still rebellious and defiant toward Valefor.
However, after many days of relentless beating, everyone had ultimately submitted and regarded Valefor as their boss. They had all acknowledged his great strength, the Celestial Dragon King included.
Interestingly, the Celestial Dragons had developed masochistic excitement and enjoyment from Valefor's beating, and their passion for training reached an even more extreme level.
If Valefor weren't free to train (beat) them, the Celestial Dragons would look for the strong Vampires to bother.
Naturally, the Vampires weren't willing to spar with such powerful Dragonoids. However, they couldn't withstand the provocations and incentives from the Celestial Dragons and eventually caved in.