Pebble from the Mountain
The vizier takes a stone from Mount Alamut, places it in his mouth and meditates for an hour. He soaks the stone in his own blood, then in the blood of another Assamite. He gives the stone to that Assamite while chanting an incantation naming himself and the subject as successors to Tiamat, Ahriman, and all the shaitans of Hell. The ritual takes an hour and a half to perform.
At any subsequent point, by placing the stone in her mouth and repeating the incantation, the other Assamite can initiate a mystical link between herself and the vizier identical to that created by Touch the Earth. She is not performing sorcery; the magic rests in the stone, which always works if the vizier's player made his initial roll.