A knight in black armor on a giant dragon crushes an enemy army, duels the king atop a burning siege tower and emerges victorious

Prompt

A gigantic dragon-riding knight clad in black steel armor scarred by countless battles, crimson cape torn by war, face hidden beneath a horned helmet
0–4s: rides an enormous dragon through a canyon as an enemy army marches below, camera flying alongside the dragon’s wings before diving toward the battlefield; 
4–10s: dragon unleashes torrents of fire across siege engines and infantry formations while the knight leaps from its back into the middle of enemy lines, cutting through soldiers with devastating two-handed strikes, sparks and blood flying through the air; 
10–15s: confronts the enemy king atop a burning siege tower, defeats him in a brutal duel, then the dragon crashes through the tower causing it to collapse entirely, ending with the knight standing atop the ruins as the enemy army breaks and flees + Hyper-realistic heroic fantasy, large-scale medieval battle, practical fire VFX, cinematic daylight destruction, brutal combat choreography.