Lost Zem (ロストゼウム), also known as the Great Black Mallet (巨の黒槌), is one of the Sept-Terrion and is the treasure governing over Earth. In contrast to the Ark Rouge, which has dominion over souls, the Lost Zem has dominion over physical bodies.
The Chief of the Gnomes can command the Lost Zem to boot into the Sacrament Program.
- 'Lost Zeum' is a portmanteau of 'lost' and 'seum' from 'museum' according to Toshihiro Kondo.
- Zem means 'earth' in Czech and Slovak.