CGI Dragon Movie

I vaguely recall watching a trailer to a movie that had two massive armies, each lead by one warrior. One warrior was male and initially wore a knight-helmet that hid his eyes and the other was female. The trailer depicted the two armies at war with each other and the male and female warriors being enemies. The two warriors might have been generals but I'm not sure. In later scenes of the trailer the two warriors are united in a quest that they embark upon, which involves dragons. The male warrior is no longer wearing his helmet in these later scenes. I believe in one scene the two are riding on a dragon and that they were being pursued by vaguely, ghost-like translucent dragon drones descending upon them from a diagonal angle and that the dragon or something else was shooting projectiles at them, making them explode. There also might have been an implied romantic arc between the male and female warriors, but I'm not sure. This film was supposed to be an animated medieval, fantasy work. I'd say the quality of the animation was really old, and it mildly resembled the animation style of the CGI 2007's Teenage Mutant Ninja Turtles. I recall the animation had a dramatic lighting effect, with bright light and deep shadows. I think the dragons in the film bared a strong aesthetical resemblance to the Mega Bloks Plasma Dragons. This film may have been marketed with Doogal, Delgo, TMNT (2007), an early Care Bears CGI film that had a superhero themed catfish trailer, or any of the Bionicle films, but I'm not entirely certain. I believe this film was released sometime in the early 2000's, probably from a year between 2003-2008.