The Mobile Fortress is a fortress which is mobile in the Energon cartoon portion of the Unicron Trilogy continuity family.
E10 mobilefortress

Apparently this was in Armada, because everyone sees it and goes "OMG, Unicron!"

Battle of the Asteroid Belt

—We have destroyed the fortress that once was home to Unicron., Optimus Prime is reading from a different script

The Mobile Fortress flies around, sometimes disguised as a comet. It blows up a lot.

It looks like a turd, which is pretty appropriate since it's extruded from Unicron's mass.

When the animators use the wrong reference art, it's perfectly smooth.

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