Tethered Prison

Pick any point within range, forming a golden Anchor there.  Golden Tethers explode from that Anchor up to 30 ft away.  Everyone in that 30' sphere that does not have complete cover is grabbed by one tether and immediately makes a Strength saving throw.   The caster may exclude people that he sees, the tethers will avoid them.  Creatures immune to being grappled are not affected by this spell. Once created, the tethers occupy space and stop magical walls and anything made of Force from coming into existence in their space.

If you fail the Strength save you are grappled for 1 round and immediately pulled (up to 30 ft)  towards the anchor but stopping if you hit something or someone. In either case you take 4d6 bludgeoning damage on a failed save.

If you make your save, you are still attached to the tether, but are not grappled, pulled, or take damage. 

While attached to the tether you make this same save at the beginning of your turn, with the same consequences. You may still attempt to use your action to end the grapple, DC is the same as the Strength save, but even this does not remove the tether.

Anyone else attempting to move a tethered person must do the same Strength save or fails to move the victim.  If a victim gets more than 70t away from the Anchor it breaks their tether.  Any attempt to teleport (or similar effect) grants another Strength save; if you succeed, you teleport and are no longer tethered, otherwise the effect fails.

The spell ends instantly if the Anchor is affected by any of the following:  Anti-Magic, successful Dispel Magic, Disintegrate, or the acid from a Storm of Vengeance.