The Story: SPOILER ALERT!: DO NOT READ IF YOU ARE PLANNING TO WATCH CRIMSON SKY, MAJOR SPOILERS! Lightning is a wolf from one of my book series, Crimson Sky (which is being turned into a series by @9DragonWolf9. Note: The animated series is different to my written one), and Lightning here is obviously very upset. Well, his friend Nightmare (originally named Shadow, but I changed it) died, and it was his fault. She trusted him, and they worked together as a team along with Willow and Silver. But behind their backs, he had been scheming with the bad guy, who I shall not name so as not to spoil the story. Soon, he had been forced to lead his friends to a certain place where they would be attacked, and hopefully killed. But in the end, only one died. Sadly, she was the one that Lightning cared for most, the one he loved. Nightmare. Lightning got over it eventually, but after everybody else. But once in a while, snow falls onto the forests and mountains, and Lightning remembers. Because when Nightmare died, soft, white snow fell. And when it fell, it reflected the blood on the ground, the life seeping out onto the icy floor, and for a moment, the whole sky seemed to turn red. One will fall, one will die Killed and reborn in the Crimson Sky.
Thanks so much to @darkfang390 for the CC and the line-art!