Dreadhorde - Lazotep Layering

On Amonkhet, the Gatewatch had uncovered another of Bolas’ long-term plans. For decades, the people of Amonkhet had trained themselves to be warriors. Then, when the best of the best had trained to perfection, they were killed and mummified, embalmed in layer after layer of the blue lazotep mineral, until they were fully coated, fully shielded. Little about them remained organic at all. Then they were resurrected, with all their skills and strength—and absolutely no will of their own. Now they served only Bolas.

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War of the Spark, Chapter 15