Rek'Sai debuted in League of Legends in 2014 as a Void champion, a tunnelling predator and queen of the Xer'Sai who hunts beneath the Shuriman desert. Riot gave her no human voice, instead building her audio from layered animal screeches, clicks and roars to signal burrowing, sensing prey and unburrowing to attack. Clips of that screech later spread beyond matches into montages, streams and soundboards, where League players recognised it instantly and other creators borrowed it as a generic monster scream for reveals and ambush moments.