The greater sith-makar rituals are held known by the castes, and are a means of awakening further the blood in a way which the Awakening began. It is said by partaking in ritual, a sith-makar strengthens their draconic ancestry. Knowledge of them is withheld outside of Am'shere, lest it fall into the hands of their enemies.
Memory of the Blood: By calling on ritual, a group of sith-makar may summon the memories inherit in their blood, the voices of ancestors, and so on. The older the blood, the stronger and older the memory. In this way, certain memories may only be available to certain tribes, and the gift of a particularly old bloodline to one of these rites is considered significant. It is also why sith are encouraged to find mates in different tribes, in order to ensure no Memory is lost.
What the sith do not say to outsiders is that so long as there is any dragon blood in the participant's veins, the tribes may call upon that person's ancestral Memories as well, even if that person is not sith-makar. This knowledge would easily make them a greater target of Charn, Rune, dragons, etc.
The ritual to do so always involves a great Fire, but details vary from shaman to shaman and tribe to tribe. DMs are encouraged to have the visions appear in the Fire itself, so that other characters may partake of the story, though this does not always need to be the case.
Sacred Objects: The bones of an ancestor, sith or dragon, are said to possess community magic and boost the Memory of the Blood. Likewise, ashes from the same--especially ashes collected from the heart--are said to be protective and encourage an ancestor to be present. The community Fire itself is considered to be significant also.