|Peace Keepers (HotS)|
An eradicator was kept in the sub-level of Research Station EB-103. Crown Prince Valerian Mengsk had it powered up when Sarah Kerrigan made zerglings. It was activated when the zerglings entered its room, but they managed to destroy it.
The Umojans shipped eradicators to the Jarban Minor science facility, which had been built to assist in their research. These eradicators were much more powerful compared to the one on Research Station EB-103, but Nova Terra managed to destroy them and recover their technology.
In Heart of the Swarm, the eradicator serves as the final boss of the mission Lab Rat. Which is can one-shot zerglings, a sufficient number focusing it down should be able to overrun it with relative ease.
Two eradicators appear as an optional boss fight in the Night Terrors mission of Nova Covert Ops. These do not have an auto attack, but they do have area-of-affect missiles and straight line railguns that are announced on the map by red lines and circles. Avoid these zones and focus down the eradicators with abilities and autoattacks. After one is destroyed, the second will increase its rate of fire, but its attacks are still very avoidable.