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

Gauss Cannon II

This unit is placed in a space area instead of on a planet. This unit can move and retreat as if it were a ship. This unit can be blockaded, if it is blockaded, it is destroyed.
Mirveda ProtectorateTechnology – Unit Upgrade – Structure – PDS

Unit Upgrade

This unit is placed in a space area instead of on a planet. This unit can move and retreat as if it were a ship. This unit can be blockaded, if it is blockaded, it is destroyed.

SPACE CANNON 4 · BOMBARDMENT 4

2move
1capacity

Prerequisites: WarfareCybernetic

Source: Discordant Stars