Only Phoebe herself teaches this rite. When properly performed, this rite transports the ritemaster and his pack, who must all follow Phoebe (or Sokhta) as their totem, to the surface of the Aetherial moon. The rite must be performed within a lunae, one of the crossroads of moon paths.
The ritemaster rolls Wits + Rituals, difficulty 7. Success transports the pack from the lunae to Phoebe/Sokhta's domain. Anyone accompanying the pack that does not follow Sokhta/Phoebe as a totem is left behind; only the lunar Incarna's children are brought to her realm.
Source: Umbra Revised