After all, he was a Pureblood Black Dragon, and even though he hadn't lived as long as the ancient Nightmare Evil Dragon Koln, there was no way he'd allow Nightmare Evil Dragon Koln to do as he wished in his dreams.
Intruding into a Giant Dragon's territory would infuriate the Giant Dragon, not to mention invading his dreams and attempting to dominate and rule over them.
Returning to his Black Dragon Form, Lance stretched his dragon body to his heart's content. He had been walking in the Human World for some time now, and it felt like a long time since he had last moved in his Black Dragon Form; it was more comfortable than his human form.
The ancient dragon who entered his dream wasn't the real body of the Nightmare Evil Dragon Koln, however, seeing him transform into a Black Dragon, Nightmare Evil Dragon Koln directed most of his attention towards him.
Facing a member of his own kind, even if this member hadn't lived as long as he had, demanded serious attention.