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Communions are a path-boosting, load-sharing strategy, which Mages can use in combat. In a Communion, Masters do the spellcasting, and so-called Slaves stand at the ready to shoulder Fatigue.
There are three separate communions an army can theoretically have at the same time. Only one is actually called a "communion", however.
Communion
The Astral Communion is the most common variety, and the quickest to perform. The Masters end up taking 25% longer to cast their spells, however, as commanding the thoughts of others is a bit annoying.
Sabbath
Entry into the Blood Sabbath typically costs a Blood Slave, and entry is slower than entering an Astral Communion. It is a very top-heavy sort of arrangement, as the Masters accrue 50% less Fatigue than in the other sorts, while the Slaves accrue 25% more.
Chorus
Only the Witches of Man and the New Testament Angels can cast spells in Chorus, splitting the load and boosting the strength through shared singing. Singers safely exit the Chorus once they stop singing, or once there are no Masters to lead the choir.
The path-boosting of Communions (and Sabbaths, and Choruses) is a big draw. Two Yogis can allow any amount of Gurus to cast Soul Slay without any investment of Pearls, for instance, while four Yogis can enable any number of Gurus to cast Enslave Mind.
The path boost is determined by the amount of Slaves the Masters can lean upon. What degree of a path boost do you want? Let's just use Astral as an example here.
If you want… | …then you need… |
---|---|
…+1… | …2 slaves. |
…+2… | …4 slaves. |
…+3… | …8 slaves. |
…+4… | …16 slaves. |
…+5… | …32 slaves. |
…+6… | …64 slaves. |
…+X… | …2 to the Xth power slaves. |