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

Breakthroughs

Thunder's Edge

Rules Reference

There currently does not exist a Living Rules Reference section regarding breakthroughs.

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tirules.com
  • A breakthrough is a faction-specific card. Players start the game without their faction’s breakthrough.

  • A breakthrough is commonly gained through an expedition, or the Thunder’s Edge legendary planet ability card. There are other game effects that can gain a player their faction’s breakthrough.

  • When a player gains their faction’s breakthrough, they perform a breakthrough roll, which may cause The Fracture to enter play.

  • A breakthrough has 1 or more abilities, and a synergy (other than for the Nekro player).

    • If a breakthrough has a passive ability and an exhaust ability, the passive ability always remains in effect, even when the breakthrough is exhausted.

    • If a breakthrough has an exhaust ability, the synergy ability always remains in effect, even when the breakthrough is exhausted.

  • A breakthrough itself is not a technology; it alone cannot be used to meet a prerequisite when researching a technology, nor can it alone be used to meet the technology requirement of an objective.

Sources

Thunder's Edge rulebook – no Living Rules Reference section yettirules2: tirules2.comCommunity: TI4 Online Discord, TI4 Homebrew Hub Discord