Does Master really need a mount at all?
On the earth's surface, after blasting its strongest dragon's breath, Black witnessed Joshua transforming himself into a mass of blazing red flame as he charged through the wave of spell attacks, making his way towards the sky fortress. Its heart is not filled with worry about what might happen to its master but with doubts about its own existence and its purpose.
The warrior could run faster than Black. He could even fly on his own. Not to mention that his power level is way beyond draconic horse's level. Black often felt that it was insignificant during battles—Master… does he really need a mount?
The draconic dragon may be troubled with worries, but the battle ensued.
In the middle of the sky.
Even though the warrior has broken through the protective barriers and the spells, the sky fortress still has some resistance.