Secure

By casting this spell, the caster makes a door, chest, or portal proof against being opened or passed through by any means short of physical destruction of the door or chest. The portal, door, or chest cannot be opened by anyone, including the caster himself. A dispel magic spell brings the secure spell to an end and a limited wish ends it, but otherwise the door or chest cannot be opened normally again.

The door or chest is protected from all physical attack for a number of rounds equal to the caster's experience level. After that, the door or chest can be broken physically but retains a number of other protections: It cannot be damaged by fire, cold, or electricity, nor can its object be affected by spells that would change the nature of the area of the spell effect: vanish, reduce, dig, or transmute rock to mud. Such spells do not have any effect on the door or chest.

A knock spell does not open a secured area, though chimes of opening do. Glyphs, explosive runes, and symbols cannot be cast upon an area protected by a secure spell. They will immediately detonate or take effect if the attempt is made. A portal protected by this spell can be bypassed by dimension-breaching magic such as dimension door or by entering the Ethereal Plane. Such movement does not alter the security of the portal. The area protected by this spell radiates a strong aura of alteration magic.

The material components of this spell are a small piece of iron and a semiprecious gemstone of any type.