AntiWarp
From ASSS Wiki
Antiwarp is an ability in Subspace/Continuum that prevents other users from warping when they are within a certain radius of you (the radius is determined by the Settings). Using antiwarp usually slows down your recharge rate, depending on the settings.
The ELVL Format defines a region attribute that masks the effect of players with antiwarp enabled. So far only ASSS implements the standard region attributes.
You must be within radar range for antiwarp to work on someone due to the Game Protocol mechanics.