Mood: The mood of this video appears to be intense and action-packed, with a sense of bravery and devotion. The theme seems to revolve around war, courage, and possibly mythology or history, given the tagline 'Based on a true story'. The overall emotion evoked is one of excitement and heroism.

Environment: The setting of the video seems to be a battlefield or a war-torn landscape, with rolling hills, mountains in the background, and a large group of people engaged in combat. The atmosphere is chaotic, with a sense of turmoil and conflict.