Void stasis

Void stasis is an psionic power demonstrated by Nerazim dark templar and Tal'darim blood hunters. Using Void energy, the caster can disable a target, freezing it and preventing it from using detection abilities.

Co-op Missions
In Co-op Missions, Vorazun's Shadow Guard have the void stasis ability, but it can only be used on detectors. Vorazun's dark templar can research void stasis at level 6.