From LSWiki
Atman Stage
Atman stage is an out-of-character concept meant to approximately measure
the level of expertise you, as a player, have with Lost Souls in general -- as
distinct from the level of a given incarnos, which measures that particular
character's progression. You usually shouldn't have to worry about your atman
stage, as it's mainly employed behind the scenes. For the most part, it's
used to make things a bit easier on new players, both by lessening some game
consequences for them and by adapting some interface elements to them. There
are also some things newer players aren't allowed to do, like set captions.
If you're tempted to try to manipulate your atman stage for any particular
purpose, please be assured that doing so will be highly unproductive and
you'll get much more mileage out of manipulating other aspects of the MUD.
The atman stages are new, beginning, intermediate, advanced, and expert.
See Also: atman, neophyte