Become an Initiate.
Membership has its privileges.
The Vault Dweller expressed interest in joining the Brotherhood. Great! Initially jubilant and welcoming, Cabbot's much more reserved after he returns from his meeting with the Elders. In order to be permitted to join, they must complete a quest: Recover a holodisk from the 'ancient order' far to the south-east. Then and only then will they be accepted as a member.
- Journey to Lost Hills and talk to Cabbot about joining. Accept the quest once he returns from the Elders.
- Purchase a rope and 2 doses of Rad-X before leaving for the Glow.
- Head to the Glow. Enter inventory upon arrival and take 2 Rad-X to gain 100% radiation resistance.
- Use the rope on the protruding beam above the crater. Use the rope to descend.
- Loot the dead soldier in power armor for the ancient Brotherhood disk, then return to Cabbot.