Storm Runner was the magnificent dun horse ridden by Cao Cao during a hunting expedition with Emperor Xian. Described as swift and agile, Storm Runner symbolized Cao Cao’s ambition and influence. During the imperial hunt, Cao Cao rode Storm Runner alongside the Emperor, often positioning himself slightly ahead, a subtle display of his dominance.

In a striking moment, Cao Cao shot a deer with the Emperor's bow, and the gathered officers mistakenly credited the kill to the Emperor. Cao Cao boldly accepted their praise, disregarding protocol and further revealing his ambition. His actions during this hunt, coupled with his position on Storm Runner, underscored his audacity and the growing tension between him and the Emperor.