It's a crossover, yes. And Eddsworld Warriors crossover.
A bit of backstory, Tord (Aspenstrike), after a whole war and everything, was eventually accepted back into his Clan and forgiven by Edd (Leafbreeze) and Matt (Foxtuft), but Hollowheart (Tom) refused to forgive him. When Edd died (I'm so sorry), Tom blamed Tord for no good reason. His mental and physical health began to deteriorate, and one night, when he was at his lowest, he accidentally poisoned himself with deadly nightshade, mistaking them for poppy seeds. He was found dead in the Medicine den the next morning. Tord was devastated, and ever since Tom's death, he had looked up to the sky in morose, wondering and asking if his old friend forgave him yet.
I still suck at Backgrounds. Dammit.