Here is a good video between two very high level players showing you how to do a Void Ray build against Terran. The map is lost temple with Emo casting. The Terran starts with a two Marauder with Reaper push but is fended off by Stalkers.
The Protoss then counters with Stalkers, Sentries, Zealots, a Void Ray, and a Phoenix. The Terran holds off the first wave but the second wave gets him. Watch this now you will learn a lot from it.
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