Annihilation Barge
The Annihilation Barge is, essentially, a massive gun mounted on a hover platform and are favoured Tarpit killers. Usually found in the lower levels of a Tomb World, anyone who SOMEHOW manages to avoid hungry, hungry Scarabs, massive Spyders, ghastly Wraiths or even the Necrons themselves will more than likely be facing the receiving end of the Tesla Destructors; an eldritch discharge of green lightning later and you'd be turned to dust...
According to the fluff, they were most often fielded by the Akannazad Dynasty Tomb World against the Orks of Charadon, tearing the armour from the Trukks and the Looted Wagons and incinerating their Boyz. They were also used in the Orphean War by the Maynarkh Dynasty against the Imperium of Man.
Using the same Quantum Shielding panels and skimmer technology as the Doomsday Arks, Ghost Arks etc, they are extremely durable but due to their low speed are used defensively. Equipped with a (Twin-Linked) Tesla Destructor, they utilize the same 'Tesla' lightning as the Carbines and Cannons which can wreak havoc among infantry as their flesh is roasted and their blood boils (In the game, every roll To Hit of a 6 adds two addition hits); it can also devastate most, if not all, but the most heavily armoured vehicles such as Landraiders or Monoliths.
Sadly for such a neat model, it isn't the most competitive. In 8th Edition, it struggled to perform next to Necron Immortal who could bring tesla to the field cheaper and in greater numbers. In 9th, it suffers from the fact that Tesla's nerfs and the fact it doesn't fit the meta (being low AP). For only 20pt more per model, you could get a really strong Canoptek Doomstalker with devastating anti-tank fire and very strong rules and synergies.