Spectator mode is where you more or less watch someone exploring the clockworks, or going on a mission.
Like, if you opened party finder, there would be an option in each box: spectate. when you press it, it gives you the list of people in the party, you click the one you wish to spectate.
Being spectated is an option. you may turn it off/on, just like inspection.
The knight being spectated has the option to block any private messages from any spectators. regular chat messages would be seen by other players spectating that party.
The purpose for this is primarily to watch people's strategies and better their own. For example. you want to use the cutter line as a weapon, but you aren't particularly good at it. So you find someone who is good at using the cutter, and spectate them while they explore, how and when to use it against a given enemy.
Of course, someone may also just feel like watching another player explore.
Feedback is appreciated
It'd be great as an option. You could show other players how to run shadow lairs without setting up a stream or something similar that takes up additional bandwidth.
Enabling spectators from the public, friends, and guildmates (all separate checkboxes) would be good. I might want to run a friends only party but have a public "showing".