In this update Grand Communions are added.

From the not yet updated manual:
Some nations have perfected the communal casting of rituals. These public rituals are usually religious in nature and performed in the nation’s capital by ordained mage-priests.
When a mage with the Grand Communion ability casts a global ritual, other mages with the same ability can use the ‘Grand Communion’ order to increase the power of the primary caster, adding their skill level to the power of the ritual. This adds to the strength of the casting or dispel attempt by the Grand Communion.

Example: An Arch Theurg is casting dispel. In the same province there are three Theurgs and five Theurg Acolytes. The primary caster invests 12 extra gems to empower the dispel attempt. Two of the Theurgs and four of the Theurg Acolytes forego other activities and join the casting using the order ‘Grand Communion’. Dispel is an astral ritual so the astral scores of all joining members are added to the dispel attempt. The Theurgs each have an astral skill of 2 and the Acolytes have a skill of 1. The total added value is four for the Theurgs and four for the Acolytes bringing the total strength of the dispel attempt up to 20.

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Units capable of joining Grand Communions
Pythium's Theurgs (MA and LA)
Marverni's Druids (not gutuater nor Stargazer)
Abysias Anathemants (All eras. Not Warlocks)
Ur (priest mages)
Uruk (Moon priests and Gala)
Mictlan (Priests in all eras. Not Nahualli)
Berytos (Brides and priests)
Gath (Kohen Gadol and Kohen)
Ermor (EA Pontifex and Flamen)

Also a few pretenders (such as the divine emperor) and some heroes.