Twilight Imperium: Fourth Edition – Thunder's Edge

At the end of your turn, you may pay the cost shown on an unclaimed slice and place one of your control tokens there. Each slice can be claimed only once; the first time you claim a slice, you gain your faction’s breakthrough (p. 8).

The player who claims the final slice places Thunder’s Edge planet-side in a system without a planet, supernova, or printed wormhole; it cannot go in The Fracture. The player with the most tokens on the expedition places that many infantry there, with the final claimant breaking a tie (p. 8).

No. Synergy lets a technology or technology specialty of one linked color count as the other color for researching technology and scoring technology-related objectives—but it can count as only one color at a time (p. 8).

No. Fracture systems are not adjacent to the systems they touch on the board. Instead, a system with an ingress token is adjacent to each Fracture system with an egress token; ingress systems are not adjacent to one another, nor are egress systems (p. 9).

No. Unit abilities—including Sustain Damage, Space Cannon, Bombardment, and Anti-Fighter Barrage—cannot be used by or against units inside an entropic scar. Text abilities are unaffected (p. 11).

Yes. You can exhaust a planet with two technology specialties to satisfy either one specialty or both simultaneously (p. 11).