We don't know exactly what that trip entailed, though we do know that the Zerg stopped multiple times en rotue to absorb potentially useful species. It's possible that some of the worlds they came across had Khaydarin crystals as well.Zor wrote:The Swarm was doing just fine before it reached Aiur.Tribble wrote:To what degree are the Zerg dependant on the Khaydarin crystals? If I remember correctly, the Overmind deliberately evolved the Zerg to incorporate them. That could potentially be a huge problem as the crystals were artificially created by the Xel-Naga and probably wouldn't exist in the AQ.
Zor
If I remember correctly when one of the Zerg's deep space probes was captured by the Protoss, they used a Khaydarin crystal to study it. It naturally reacted to the crystal, and that is what told the Protoss that the Zerg must have been created by the Xel-Naga. Also crystals were required for the Overmind to manifest itself on Aiur. And crystals have on occasion been used to control Zerg.
The Protoss use them to aid in their psionic powers. It's possible that the Zerg use them in a similar fashion, perhaps to help maintain their psionic link with each other? IMO the crystals are of some importance at least, and their absence could have negative impacts long term as the Zerg run out of their energy.