Thiondar's Permanent Anti-Magic Field

This spell creates a transparent barrier around any one object, causing it to become impervious to magic and spell effects. The anti-magic field prevents the entrance of spells, and hedges out summoned or charmed creatures.

The spellcaster can choose to cast one 2nd-level or two 1st-level spells on the object beforehand; these are then made permanent and protected from being dispelled as well. For instance, a wizard could cast hold portal and alarm on a door or chest, then conclude by casting Thiondar's permanent anti-magic field. The field itself can be countered only by similarly powerful magics; a rod of cancellation or Mordenkainen's disjunction, for example. The anti-magic field can be destroyed by a wish. Casting the spell permanently lowers the wizard's Constitution by one point.