|The following is based on information from Van Buren design documents and is not canon.|
When the Prisoner enters Vault 29, they can find the ZAX-29. The ZAX can teach the player character that Diana Stone is the goddess of the Twin Mothers tribe. They can however only speak to her through a projector that is controlled by the ZAX. If the Prisoner has a high enough Science skill, they can reprogam the ZAX and put his own picture as the hologram in the recording, thus replacing the goddess.
Control over the Twin Mothers tribe.