Secure Seal, Greater

7th-level abjuration

Casting Time: 10 minutes
Range: 30 feet
Components: V, S, M (gold dust worth 500 gp)
Duration: Until dispelled
Classes: sorcerer, wizard

This spell functions as secure seal, but it can be cast even on an opening without a door or similar barrier, such as an archway, alleyway, corridor, or similar opening, preventing creatures from passing through the sealed location. If cast upon an actual door, gate, chest, or similar object, it increases the object’s damage threshold by 10, its break DC (if any) by 5, and increases its hit points by 5 per caster level.

The warded object is always entitled to make saving throws as if it were you. A greater secure seal can be removed with dispel magic, but the caster level check to dispel gains disadvantage.

Like a secure seal, if the portal or opening guarded by this spell is destroyed or forced open, it explodes in a 20-foot-radius burst, dealing 15d6 force damage. Unlike a secure seal, this explosion does not end the spell, though it cannot explode again until 24 hours have passed.