Bounded Field

An area with a bounded field around it is magically secured. sound cannot pass through the barrier at the warded areas, any creature that attempts to notice the barrier must pass a wisdom saving throw of your spell save DC or have their attention diverted away any creature that passes this saving throw is immune to the effect for the next 24 hours, sensors created by divination spells can’t appear inside the protected area or pass through the barrier at its perimeter.
Creatures in the area can’t be targeted by divination spells. only those who that the bounded field is programed to allow can teleport to and from the area including planar travel. the barrier alerts the caster to the position of any unauthorized intruder within the barrier. The bounded field cannot be dispelled by "dispel magic" it can only be dispelled by destroying the key stones keeping it active.

The spell requires four keystones to function at a minimum, the range of the field with four keystones becomes 200 square feet. Adding additional keystones will increase the are by 50 square feet each. A keystone that is destroyed will not immediately shrink the field but needs to be replaced within 24 hours or the barriers size will be reduced. The AC of a keystone is 18 and each keystone has 5 HP.