Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

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Limited Vision

You may not place a stage II objective card on your faction sheet until all stage I objectives have been revealed.
Augurs of IlyxumFaction ability

You may not place a stage II objective card on your faction sheet until all stage I objectives have been revealed.

Source: Discordant Stars