Official rule text
90.22 When a Valefar Assimilator token is on a technology, that b The chosen players can only use the secondary ability once, technology’s color and type count toward objectives. and they cannot use it by spending command tokens. RELATED TOPICS: Command Tokens, Exhausted, Initiative Order, 92.5 After the active player resolves the primary ability of the
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 90.22