Word of Binding

This spell is cast by uttering a magical word as the door, lock, flap, shutter, or cupboard (the spell will extend to several small doors attached in the same enclosure, or offering access to the same space) to be “bound” is touched. Thereafter the caster can freely open and close the bound access point without disturbing the spell, but any other creature must physically break the bound door or access point to pass it, successfully cast three dispel magic spells upon it (any amount of time can pass between these castings), or cast knock twice. The death of the caster of the word of binding also ends the magic.

This spell can be so cast (by using a slightly different word) to allow all clergy of Oghma to freely pass the binding, or (by use of yet another word) to allow a single other being besides the caster to pass the binding freely. This other creature must be touched by the caster during the spell's casting.