Dimensional Sentry
Abjuration, Conjuration, Divination, Planar, Teleport
Activation: 10 minutes
Target: 20-foot emanation/tier
Duration: 8 hours
Rolls: Will negates
For the duration, anyone attempting to use a calling, planar, summoning, teleport, or any other interdimensional effect of equal or lower tier to, from, or through the emanation, must succeed on a Will save against this effect's DC or temporarily be caught in a pocket dimension and held in stasis. The creator of this effect is alerted to the attempt and can make skill rolls to analyze the effect and targets in the pocket dimension as if they could see them. 1d4+1 rounds after this happens, the pocket dimension releases what it captured to their intended destination and their interdimensional effect completes what it was trying to do.
Big Delay (+1): Each time you add this upgrade the pocket dimension holds the targets in stasis for an additional +1 round.
Interdimensional Spider Trap (+1): If the intruder fails their save, you can redirect their interdimensional effect's intended target location to another location of your choice within range of this effect's area. This applies even if you move the area while they are stuck in stasis. So you could teleport somewhere else while they're in statis, redirect their interdimensional effect to a new location, then leave.