The Manti Dreadnought is a huge Manti. It is the size of a small capital ship, and it has the power to kill GSA bases. It was first seen while retaking the Mars Stargate Beacon.
Although there is no official description, the Manti Dreadnought is a huge massive Manti that is the as large as the Patriot, minus a few meters. But there is virtually no weaknesses, how this manti was birthed remains a mystery, but considering that the Earth has been turned into a Hive world, it may have been a larva at one point.