The Roaring Knight is a mysterious antagonist from Deltarune, the indie role-playing game by Toby Fox. Known for immense power and a terrifying presence, the character became a major talking point among fans after appearing in the game's later chapters, with its roar becoming instantly recognisable in boss fight clips and lore videos. As Deltarune content spread across YouTube, TikTok and Discord, creators began using the full roar on its own to signal danger, dread and overwhelming force. It remains popular because it carries the weight of that boss encounter even without any visuals.