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

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Mantle Cracking

ACTION: Place 1 "Core" token on a non-home planet you control other than Mecatol Rex that does not contain a Core token to gain up to 4 trade goods.
Gledge UnionFaction ability

ACTION: Place 1 "Core" token on a non-home planet you control other than Mecatol Rex that does not contain a Core token to gain up to 4 trade goods.

Source: Discordant Stars