Avenger (XCOM 2), XCOM Wiki

The Avenger is a converted alien supply craft that serves as XCOM mobile base of operations, featured in XCOM 2. Formerly used by the aliens to transport large amounts of supplies, the vessel that would become the Avenger was recovered by the reborn XCOM crew, who quickly turned it into their new base of operations. Though the ship remained grounded due to a lack of key components, preventing it from becoming fully operational, it nevertheless remained key to the struggle against the alien force

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