Rey Dau debuted as the flagship monster of Monster Hunter Wilds, Capcom's 2025 hunting game, where it rules the Windward Plains as an apex flying wyvern charged with lightning. Its roars became instantly recognisable to players who faced it in early hunts and trailers, and fans soon clipped its voice sounds for soundboards and edits. The clip remains popular because it captures that boss encounter in just a few seconds, making it an easy shorthand for power, danger, and a storm about to break in gaming content.