Undertale was released in 2015 by Toby Fox, who also composed its soundtrack. Asgore Dreemurr, king of the monsters, is fought near the end of the game, and his battle track combines the short intro Bergentrückung with the main ASGORE theme, reusing motifs heard earlier in the story. The track became one of the most recognised pieces from the soundtrack, shared widely in remixes, covers and fan animations, and short excerpts now circulate as a shorthand for a sorrowful, reluctant final boss.