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The phase prism is a variant of the warp prism developed after the End War by Daelaam phase-smiths using Nerazim technologies. It channels Void energies, and has become quite popular among Nerazim commanders.
"Phase prism" was the original name for the warp prism, and had a more Nerazim motif to it. This was changed later into the development of Wings of Liberty to a Khalai style to better fit the gold protoss art style and to avoid being mistaken for a zerg unit. The model of the Shakuras warp prism reflects the alpha design of the phase prism.