Seiya is the Pegasus Knight and hero of Saint Seiya, the Japanese manga and anime series created by Masami Kurumada in the 1980s. In the story his friends and allies repeatedly call out his name in moments of danger, and the Spanish phrase muere Seiya, meaning Seiya dies, has become shorthand online for those dramatic defeat scenes. Clips of the shout spread through anime edits, reaction videos and soundboards, where fans reuse it to mark a sudden loss. Its staying power comes from that mix of nostalgia and over-the-top emotion.