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The reaver is a protoss mobile siege-artillery unit.
Reavers are heavy ground artillery, though are not artillery in the classic sense (of terran understanding) in that they don't lob unguided projectiles. In fact, the reaver itself does not mount any weaponry, but instead houses a micro-manufacturing plant similar to the carrier, producing tiny robotic drones known as scarabs. While the reaver looks ungainly, just one of these war constructs can level a colony in minutes.
Tube-like protrusions are located on the sides of the reaver's head, giving the appearance of 'eyes'. These are used to help the reaver navigate. Reavers are limited in mobility, and are often shuttled by protoss air units.
The reaver evolved from a civilian mobile manufacturing unit that was militarized to become a mobile artillery piece, ensuring that fewer lives would be lost when assaulting enemy bases. Somewhat fittingly, reavers are renowned for leveling entire colonies in moments.
Reavers fell into less use after the end of the Brood War, but remained part of the Daelaam's arsenal in clearing out zerg hive clusters. A number of reavers came back into service during the End War when Phase-smith Karax developed automated scarab production based on the Spear of Adun's star forge.  Reavers were also deployed against the Daelaam by Amon in defense of the psionic matrix, but were able to be reclaimed by Karax. They were deployed by the corrupted Golden Armada against the Daelaam defending the xel'naga Keystone, but failed in their objective.
- For StarCraft gameplay information see: Reaver (StarCraft).
- For StarCraft II gameplay information see: Reaver (StarCraft II).