Official rule text
87.5 The “Sustain Damage” ability cannot be used to cancel an b The player may choose to not move any ships. effect that directly destroys a unit. c After the “Move Ships” step, all players can use the “Space
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 87.5