This is from the Asriel Dremmur boss fight from Undertale. If you don't know the story and don't want spoilers then don't read this. The story of Asriel Dremmur. A long time ago, monsters were trapped in the underworld and they needed 8 human souls to come back. So there was once a human who was in the underworld and she became best friends with Asriel Dremmur. So one time the human died so Asriel brought her to the overworld but the other monsters thought that he killed her so they killed him. Sometime later a scientist accidentally put Asriel's soul in a flower, so that is how he became Flowey. A long time later after the monsters had 7 human souls ( you playing the game are the 8th human soul) and near the end of the game, all of the monsters gather around you because they are your friends (this is the true pacifist ending) and then out of nowhere Flowey appears and absorbs everyone's souls so that he can turn back into Asriel. So that's the story and this is the music when you fight him.
Music by docterwho80918
