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

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Migrant Explorers

After you explore a frontier token in a system, you may explore a planet you control that is adjacent to that system.
Dih-Mohn FlotillaFaction ability

After you explore a frontier token in a system, you may explore a planet you control that is adjacent to that system.

Source: Discordant Stars