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

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Shard Volley

When 1 or more of your units produce 1 or more hits during a BOMBARDMENT roll against a planet, produce 1 additional hit for that roll.
Zelian PurifierTechnology – Warfare

Warfare

When 1 or more of your units produce 1 or more hits during a BOMBARDMENT roll against a planet, produce 1 additional hit for that roll.

Prerequisites: Warfare

Source: Discordant Stars