The cybernetics core provides upgrades for protoss aircraft and protoss cybernetic units. It also allows access to the advanced tech tree.
Within the cybernetics core are the necessary construction materials, automated factories and the mysterious essence translators that bond the spirits of fallen protoss to the cold metal exoskeletons of the dragoons. Eventually, by focusing through the Khala, the fallen warriors can control the movements of the quadrupedal dragoon as naturally as if they were within their former bodies.
Sentries produce false copies of units to distract opponents. Duplicates have the same number of hit points as the original but take double the damage. The number of hallucinations created depends on the unit: gateway units spawn in twos, probes in fours, and all other units spawn one.