For everyone that likes Warhammer 40k Tabletop and Dawn of War Games or anything to do with Warhammer 40K.
A Macrocannon is the largest form of Auto Weaponry, and is much heavier even than the Autocannon, essentially serving as a type of artillery piece. They fire massive and explosive shells at a maximum range of around 40 kilometers. Although it is possible to mount Macrocannons on heavy vehicles, they are more suited for use as emplacements and for static defence due to their considerable size and potency. Macrocannons are a Standard Template Construct (STC) technology, and often form the primary weapon of Imperial starships.