Assimilator

This is the Protoss Structure used for harvesting Vespene Gas.

Overview
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The Assimilator is the Protoss Structure that harvests Vespene Gas. It must be built on top of an active Vespene Geyser, usually located near a Mineral Line. Each Probe assigned to the Assimilator returns 4 Vespene Gas to the Nexus per trip. Three Probes are the maximum that can mine an Assimilator efficiently. Due to the nature of Protoss Units generally being costly, and to the nature of tech being so valuable, Assimilators are an enticing target for harassment.