Praxus-Delta

Praxus-Delta is a location in the Original Universe. It was visited by the Twilight during Blackout's rampage against the worlds who had defeated him in the Battle of Impel Down.

Once the Twilight arrived at Praxus-Delta, Starscream took over the ship and attempted to use it for his own ends. Blackout soon reclaimed the ship, trapped Malygos on board, and tricked Xavalis into activating the timer of the ship's fusion bomb. Everyone managed to escape but the ship was destroyed. Its remains are presumably still at Praxus-Delta.

Trivia

 * In Transformers canon, Praxus-Delta is a location on Cybertron. It is unclear if it's the same in BZPB, since the Twilight was able to orbit it like a planet, but that might have just been a grammatical oversight.