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

Proxima Targeting VI

Cancel 1 hit produced by BOMBARDMENT rolls made against your ground forces for each of your galvanized units present. At the start of a round of ground combat, you may resolve BOMBARDMENT 8 (x3) against your opponent's ground forces; if you do, make an identical roll against your own ground forces.
Last BastionTechnology – Warfare

Warfare

Cancel 1 hit produced by BOMBARDMENT rolls made against your ground forces for each of your galvanized units present.

At the start of a round of ground combat, you may resolve BOMBARDMENT 8 (x3) against your opponent's ground forces; if you do, make an identical roll against your own ground forces.

Prerequisites: Warfare

Source: Thunder's Edge

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tirules.com
  • When the Bastion player makes the BOMBARDMENT roll against their own units, they will be able to cancel a hit for each of their present galvanized units.
  • Other players with galvanised units cannot cancel the BOMBARDMENT hits produced by Proxima Targeting VI.