The Witnesses

 are a summon in the Apostle Entheate legacy, key to achieving a major victory.

Send a Maid-in-the-Mirror to lure a Witness
"My Maid will lead the sleeping soul through the White Door, and bear them up the Ascent of Knives, until what is left of it sees the Allure at the Crossroads."

Talk to a Maid-in-the-Mirror about The Allure and after 60s it will either create The Witnesses: One of Seven or grab an existing version of the Witnesses and upgrade it after 10s.

While collecting The Witnesses, they have a decay time of 180s. Once seven have been acquired, they are permanent.

Speak with the Witnesses
"Sometimes they look at me. Mostly, they look at the light. I see them sigh; I see them touch one another gently. They are still human. The light soaks into them, and into me. Perhaps I have helped maintain their attention."

The lesser stages of the Witnesses can be talked to with no additional requirements, and after 60s will produce Fascination. Usefully, the Fascination can be used with Study to reset the timer on The Allure. Once the Witnesses become A Cloud of Witnesses, this no longer works.

The Gate Opens Outwards
The Witnesses may be used in the Rite Intercalate to achieve the major victory, the Third Mode.