The ancient assimilator is a protoss assimilator enhanced with xel'naga technology. In an alternate timeline where Zeratul survived the opening stages of the End War, the dark prelate utilized these structures against Amon's Forces to harvest vespene gas automatically.
The ancient assimilator is an automated assimilator available for Zeratul in Co-op Missions. When an ancient nexus is constructed, it will automatically begin construction of all buildable vespene geysers in range. If destroyed, the ancient assimilators can be manually rebuilt for no cost.
Vespene Gas is automatically harvested from Ancient Assimilators without requiring Xel'Naga Precursors.
Increases the shield armor of all protoss units and structures.