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The reaver is a protoss mobile artillery unit.
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 disuse after the end of the Brood War, but began to come back into service during the End War when Phase-smith Karax developed automated scarab production based off of 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.
Scarabs are small, highly explosive drones constructed and launched by reavers. They are launched at enemy targets and installations in groups, able to level enemy structures in moments. Unlike interceptors however, Scarabs do not return to the reaver. Instead, they explode on impact, generating devastating electromagnetic fields that cause heavy damage to their targets.
- For StarCraft gameplay information see: Reaver (StarCraft).
Robotic siege unit
100 (+50 vs. structure)
Legacy of the VoidEdit
Reavers are playable in the campaign of StarCraft II: Legacy of the Void as a robotic siege unit, one of three options with the colossus and the wrathwalker. The reaver can now by set to auto-build scarabs and does not require minerals to build them. It is a slow unit compared to other units, but moves quite faster than in the original StarCraft. Due to the general improved AI of StarCraft II, reavers choose their shots better and their scarabs have better pathing, making them overall more effective.
Reavers are useful against clusters of enemy units that it can decimate with scarab shots. However, it lacks the cliffwalking of the colossus and wrathwalker, making it more difficult to position, and it moves and attacks slightly slower than the colossus. Compared to the colossus and the wrathwalker, the reaver fills a compromise between the colossus' splash damage and the wrathwalker's higher single-hit damage.
The following section contains information from a previous version of StarCraft II which is no longer valid.
The reaver made a brief appearance in StarCraft II promotional material. However, it was removed from the BlizzCon 2007 build of the game. Its role as a siege unit was given to the colossus, which possesses superior mobility and hit points and occupies the same position in the protoss tech tree as the reaver.
The reaver was meant to appear in the StarCraft II: Wings of Liberty campaign and in the map editor, but was not present at release. An incomplete tooltip in the editor implies the reaver would have had a new passive ability that boosted its movement speed when not currently constructing scarabs.