Phasing

Phasing is client-supported logging. This spell is the only one of its kind: it can be cast at any time, whether held, blind, or otherwise incapacitated. The spell itself turns you into a logoff ghost.

It functions exactly like current ghosts, but keeps you present, so that you don't actually need to close the client. It also gives you more information about how long you have and what enemies are present, so it is preferable to logging.

If you log off, you become a traditional ghost, but your 'pen time' remains the same - there is no advantage to be had by phasing or logging in some weird combination.