Watchers

"Mortals. Perhaps even ordinary mortals. But quite a number of them. They can be fought, seduced, or deceived."

- In-game text

 is an Obstacle appearing during Expeditions. Its Aspect is Guardian.

Defeating
"Locals with a grudge or a duty or a mercenary contract. We might trick them with Moth, seduce them with Grail, or battle them with Edge."

- when confronting the obstacle

As hinted by the description, Followers with, , or aspects can overcome this Obstacle with a probability depending on the aspect magnitude.

"Their blood pumps bright, then dark. They should not have opposed us. We move on."

- The Watchers' End (after success.)

Our strength...
 * 1 < < 5:  ... may not be enough. The Watchers may be too much for us - but we still have a chance. 30% chance of success.
 * 5 <= < 10:  ... is considerable. The Watchers aren't ready for us. We should be able to bring them down. 70% chance of success.
 * 10 <= :  ... is matchless. The Watchers will almost certainly regret standing against us. 90% chance of success.

"Their bewilderment is our opportunity. We'll pass in silent secrecy."

- The Watchers' Confusion (after success.)

Against the Watchers:
 * 1 < < 5: A Desperate Deception. 'They went... that way?'  30% chance of success.
 * 5 <= < 10: A Likely Deception. 'Awake! Awake! They're upon us! That way, quickly!'  70% chance of success.
 * 10 <= : A Powerful Deception.  'Look closer. Closer still. Closer! Keep looking. Closer. Now close your eyes...' 90% chance of success.

"Their present pleasures will end ill for them. Perhaps they'll think it's worth it. Meanwhile, we can pass."

- The Watchers' Fall (after success.)

Against the Watchers: 
 * 1 < < 5: The Grail's Distractions. Perhaps we can sway the Watchers from their purpose. 30% chance of success.
 * 5 <= < 10: The Grail's Temptations.  Our allures should sway the Watchers' minds. 70% chance of success.
 * 10 <= : The Grail's Seductions.  'Come closer, dear ones. We have something special for you.'  90% chance of success.

Failure
"They are more cunning and more numerous than we'd expected! This will end in blood for us -"

- The Watchers' Victory (after failure)

Failing to overcome the Watchers has a 70% of injuring a Follower.