Official rule text
84.2 STEP 2—The speaker places one trade good token from the 87.3 A damaged unit cannot use the “Sustain Damage” ability until supply on each strategy card that was not chosen. it is repaired during the status phase or by another game effect.
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 84.2