Frostmourne is the cursed runeblade carried by Arthas Menethil, the Lich King, in Blizzard's Warcraft universe, and the phrase became closely linked to him during World of Warcraft: Wrath of the Lich King. Players first encountered the sword's corrupting power in the story of Arthas's fall, and the line later circulated through gameplay videos, montages and soundboards as shorthand for the Lich King's presence. Its short length and instantly recognisable villainous tone have kept it popular for gaming edits, reaction clips and Halloween-style content long after the expansion's release.