Kingdom was recorded, and mixed in July, August, and December 1997, and February 1998 at Selani Studio in Olsztyn, and 2.47 Studio in Warsaw. Enhanced track contains PC CD-ROM Data track with video for "Incarnation" in Video For Windows format, encoded using four different quality settings. Piotr "Peter" Wiwczarek talked about remixes on the album, saying:
To be honest, we had to do it because nobody wanted to release the album with like fifteen minutes total time. So, we had a couple of remixes made with different friends and there was even an idea to make a full album just with remixes, but we found out it's not a good idea, we don't need it. We're Vader and... it's not good. It's not bad to put two songs as bonus tracks, to kind of experience something, but nothing more, I guess.