By Born Of The Flickering (1996) Frode Forsmo (a.k.a. Gonde) had replaced Tristan, but Åkesson was soon to go by the time The Pagan Prosperity followed the next year. During this time many of the members were experimenting in other bands, a common practice in Norwegian black metal and indeed, Old Man's Child had by this time made the switch from basic heavy metal into black metal.
Ill Natured Spiritual Invasion was next in 1998, but the band was now a duet with only Galder and Gene Hoglan (ex-Strapping Young Lad/ex-Dark Angel/ex-Testament/ex-Death/ex-Daemon) as a session drummer. But when Revelation 666: The Curse Of Damnation was released in 2000 the whole band had been replaced with himself as the only remaining constant to add Mennoch (bass), Grimar (drums), the returning Kenneth Åkesson and Jardar. Galder went off to join Dimmu Borgir, but never gave up on Old Man's Child, and after a three year break would return with In Defiance Of Existence in 2003 with only himself, Jardar and Nicholas Barker (ex-Cradle Of Filth/ex-Dimmu Borgir/ex-Lock Up) on drums.
After the release of the The Historical Plague (2003) box set, Galder was alone for Vermin (2005) and Slaves of the World (2009).