Achilles' Heel: While some units in the other races are crippled by Energy drain or an EMP, all Protoss units are potentially screwed over because their shields will be depleted.
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Other Protoss that had served the Xel'Naga and left Aiur with them founded the Tal'Darim, a brutal war-loving tribe that made their home on Slayn, where they made preparations for the day the Xel'Naga would call on them to serve again.
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Some Protoss that rejected the teachings of Khas and the Khala were banished from Aiur and become the Nerazim, the Dark Templar, who eventually settled on Shakuras. The Protoss on Aiur reformed into a great and glorious Empire that explored the stars and colonized the sector, and it was under the banner of the Empire that the bulk of the Protoss race lived. The Aeon of Strife came to an end when the philosopher Khas founded a belief system known as the Khala, which teaches the Protoss to use their telepathic powers to temporarily join minds, bestowing profound empathy and understanding of each other. The Protoss tribes blamed each other for this and the entire planet descended in a civil war, an age known as the Aeon of Strife.
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The Protoss worshipped the Xel'Naga as gods, but the Xel'Naga believed their experiment was a failure and left Aiur. Eons ago, an alien race called the Xel'Naga came to the world of Aiur where a species called the Protoss lived and genetically augmented them, believing the Protoss possessed "purity of form" needed for their experiments.