There is no 'quit' command in Icesus, but leaving is easy.
The simplest way is to just close your client or disconnect. This puts you
into linkdead state where you stand, with your equipment safe. Log back
in any time and you will pick up exactly where you left off. If you are
still linkdead (or idle) when the daily reboot happens, you will be moved
to the last inn you visited and logged out automatically.
At an inn, type 'leave game' for a clean save and logout. Your equipment
rests in the inn's locker while you sleep. If you are new here, that
command works wherever you happen to be standing - you will be guided to
shelter first.
Stuck out in the wilderness? Citizens of Vaerlon can 'tell ereldon teleport'
and the old sage will bring you back to the city for a small fee.
As a last resort, 'emergency_quit' will save your character and log you
out, but it drops all your equipment first. Prefer any of the options
above, or ask a wizard on the newbie channel for help if you are truly
stuck.