Arena of Valor is a mobile multiplayer online battle arena game in which two teams fight to destroy each other's base, and first blood is the traditional MOBA term for the first kill of a match. The game's announcer calls it out as soon as that kill lands, making it a familiar sound for players who follow ranked matches, streams and esports broadcasts. Clips of the call have spread through gameplay montages and short-form edits, where it works as shorthand for an early advantage. It remains popular because it is short, dramatic and immediately understood by MOBA fans.