Trace On comes from Fate/stay night, the visual novel and anime franchise created by Type-Moon, where Shirou Emiya uses the phrase to activate his Projection magecraft and recreate weapons he has seen. As Fate clips spread through anime forums, YouTube edits and soundboards, the line became a shorthand cue like Za Warudo for a character switching into combat mode. Its brevity and recognisable delivery keep it popular for fan edits, where two words are enough for Fate viewers to understand exactly what is about to happen next.