The ship triumph isn’t about stopping nightmares from sacrificing during stages 1-4, it’s about during the boss fight allowing five phases of nightmares BEFORE killing the boss and having none of them sacrifice themselves.
Did a full 1-boss clear and wondered why I didn’t get the triumph, because we killed the boss only after three phases.
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Wait, so you need to kill the nightmares fast, but the boss slow? That doesnt seem to make sense. Time would run out surely?