T3 heavy artillery installations are tech-3 structures designed to perform long-range bombardment of enemy bases. They are indirect fire units. T3 heavy artillery are extremely expensive. Although not in the same price range as the game-enders, they are roughly 3-4 times as expensive as most Experimental units and should be reserved for situations where experimental units or overwhelming numbers of T3 units would be incapable of doing the job, such as super-heavy defence lines capable of chewing up a Galactic Colossus. Nukes can also be considered as a much cheaper alternative if your opponent is careless enough to neglect their defence. Still, T3 artillery is much harder to counter, and has more hit points than the game enders (except the Scathis, which is usually only covered by Cybran S