Excellent animation and style; worthy of big movie animation comparatively.
First, the movie was extremely predictable. I knew what was going to happen before I even saw the little girl due to the scream of the man off screen. Plus, her helmet had blood on it. I don't know of any way to make it less apparent off-hand, but might want to tone that down.
Second, I noticed the narrator's voice and Celtic symbols seemed to start a trend of a specific origin, but I'm not aware of any guardian legends such as this one. Was it derived from some myth?
Finally, the narrator's prose throughout needs some work. Some of the words seemed forced, and there wasn't much of a tempo although it seemed there was supposed to be.
Just some critiques that I hope are enlightening. Great work though! I'd love to see some more projects!