Does anyone know what he used the Dance of December Souls albums? I am assuming he used the boss gt 3, but was curious if maybe he used something else. I have no idea what he used for an amp back then either. Any help would be awesome.

The GT-3 was build in 1999. So too late
I would guess they used the amp of the Unisound studio back than. Probably some Marshall JCM 800 ?
No offense, but I think you should rather thank Blakkheim for his post than commenting on the pic.
Those are the kind of infos nobody else can give.