Agy

it's been done for some MArts. for example the zar'akal who plays siegmund can basically be taken over by ST for eventline purposes if they desire but the chances of that happening are slim

Here is an example of this mechanic applied into a MArt. Even though I’m the perfect ET who can do no wrong, and my cadre of lackeys are almost as competent as me (/j), I think this kind of thing I BAD. Giving a shitter ET with one week on the job a license to **** with one specific group is a recipe for targeted bullying. 

Yes, actually! Veil Watchers have two sets of abilities that would fall under that description. One that notifies them of any disturbances to the Veil be it the opening of closing of tears - traditionally a Player Group thing - and "Major Voidal Events" which is wholly in the realm of ST Discretion.

Otherwise, through Communication, Greater Horrors are capable of inflicting visions onto Veil-Watchers at any distance - Lesser Horrors can do the same, but require physical contact with the Watcher's head. In addition, a Veil-Watcher can reach outward to attempt to commune with a Horror, though they are not obligated by any means to respond as such is a ST Interaction. Werewolf's current eventline has essentially functioned around the Communication ability, as the Horror rudely skype-calls every Veil Watcher every so often.

Given the nature of Voidal Horrors, this is the first time I've ever seen this ability used and I thoroughly enjoy it - Communication is the source of a Veil Watchers mental anguish, as Horrors in general tend to inflict hallucinations upon their mind for their own enjoyment, and the induced discomfort it causes. To me it's a neat bit of lore that provides a passive effect on my character, with room for at literally any time a ST to decide a Greater Horror would like to do some trolling.