From Command and Conquer Wiki
The Stasis Chamber allows the
Scrin to deploy their most advanced 'infantry':
Shock Troopers and the
Mastermind (which also requires the
Technology Assembler). The Stasis Chamber not only allows the production of these units but also provides the Scrin with the ability to deploy a
Stasis Shield, which is capable of preventing the movement of any units on the battlefield over a fairly large radius, while also rendering them invulnerable. This ability has proven to have numerous tactical ramifications.