Developed by the Adeptus Mechanicus, stasis grenades are extremely rare and expensive to acquire. This and their specialized nature means their issue is limited to special Imperial agents rather than common soldiers.
On activation, the grenade emits a stasis-loop field around itself. Everything within the field exists in the same moment repeated over and over. Eventually the grenade's power source is expended and the field deactivates. As their power source is rather small, the stasis field caused by an activated stasis grenade does not normally last for a long time, though the duration is normally long enough to cause a significant amount of battlefield disruption.