User is the person accessing system (or systems) by controlling body through soul. TsukiRep has stated that users are immortal. User can control more than one soul, effectively allowing them to access multiple systems at once. Furthermore, systems which allow users to connect without a soul are known to exist. A new soul is assigned to a user after soulshatter.
If a souls is unassigned to a user, it shatters. This means that there are no "unallocated" souls.
|This article is a stub. You can help improve this wiki by expanding it.|