Official rule text
25.4 A player can control a planet that they do not have any units their play area. Then, they gain one victory point. on; that player places a control token on that planet to mark that they control it. 27.4 After a player removes the custodians token from Mecatol Rex, the agenda phase is added to all subsequent game rounds,
View official source
Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 25.4