Bereavement
Bereavement is listed as the 106th track in the Undertale Complete OST, an add-on to the original UNDERTALE Soundtrack. It is a remix of ASGORE and Bergentrückung. It is present on all the Fangamer releases of the soundtrack, as a bonus track.
Bereavement was one of the stretch goal rewards for the Undertale Kickstarter alongside Dating Start (FM Version) and Dog Dating.