The sound comes from Matthias, a character in Limbus Company, the turn-based role-playing game developed by Project Moon. His Iri Wara laugh has become a recognisable fan favourite, passed around in gameplay clips, character edits and reaction videos rather than through any single official trailer. Because the delivery is so theatrical, it works outside its original scene too, letting fans reuse it as shorthand for madness, overconfidence or a plan going gloriously wrong.