YOU SHALL NOT PASS!

Threshold

Classes Mystic 6, Witchwarper 6
School enchantment
Casting Time 1 standard action
Range Touch
Area one 60-ft. cube/level (S) up to the walls of the building
Effect An invisible wall of force protects one domicile
Duration 24 hours
Saving Throw none; Spell Resistance no

Description

An immobile, invisible wall of force protects one building. the building must have clearly delineated walls and doors. At the time of casting the caster can specify either those admitted specifically, those specifically excluded, or creature types specifically excluded from the building. Those creatures can not harm the walls of the building directly or indirectly nor enter the via teleportation or planar travel. Damage from those creatures does not register. However, anyone inside the building can invite any creature in. If a creature that was excluded from the spell is welcomed in knowingly, then the spell immediately ends.

Thoughts?