They also wield some of the most advanced in Protoss tech. Estimating them to be anywhere near anything -not- 40K would be a poor idea. [i]Purifier Sentinels[/i] are Protoss Zealots, just made by Purifiers and can rebuild themselves once every minute, or so. Furthermore, Purifiers have a ship they were put to sleep on (Cybros) which has the ability to purify things, such as entire Zerg hives.