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The following section contains information from a previous version of StarCraft II: Heart of the Swarm which is no longer valid.
The shredder was a mobile unit produced from the factory. It could create a whirlwind of radioactive death around it. The attack was automatically disabled if friendly units entered within range. It was particuarly effective against zerg opponents.
The shredder began its life as a "napkin concept"—a term for low-detail concept art, with most of the actual design left to unit modelers. An early concept had it being structurally similar to spider mines.
The shredder was cut from multiplayer by April 2012. Testing showed it confused players; the unit was being used for quickly killing workers rather than for its intended purpose of map control. Additionally, its role overlapped with that of the siege tank.