Castle Walls
9th-level Abjuration Casting Time: 2 hours Range: touch Components: S, M (emerald dust worth at least 10,000 gp, which the spell consumes, a trinket or another item that can be worn or carried) Duration: Until Dispelled
You touch a continuous enclosing structure such as city walls, a fortress, or a home and imbue it with magic along with a trinket or other item. For the duration of the spell any damaging effect like lightning, a loosed arrow, or a spell for all intents and purposes is stopped upon entering the threshold of the structure.
The spell does allow entry from creatures and abilities or spell effects that don’t deal direct damage like the Reverse Gravity, or Scrying Spells.
When this spell is cast the trinket used with the spell then becomes an item which can be attuned to. Any creature attuned to this item can decide whether a damaging effect can cross the threshold. If the item remains unattuned no damaging effect can enter or leave the threshold.
Any spell trying to remove the effects of this spell must be cast upon the associated trinket and a wish spell will not work unless the form of the trinket is known to the caster. Finally, if the trinket leaves the threshold of the structure, this spell will become dispelled.
Classes: Cleric, Sorcerer, Wizard
Technically it does have hit points that regenerate slowly based on the size of the structure, but anything short of a direct assault following an appropriate siege of bombarding attacks to the structure are going to deplete its hit points. But for the sake of a dungeons and dragons campaign and NOT A WAR GAME the players will be unable to single handedly deplete this spell except maybe if it was cast on a normal house or tent… this is really up to the DM. This is basically a DM spell anyways but I think you should allow players to cast or understand what these spells are if they so choose but at 9th level spells, they will likely take Meteor Swarm or Power Word Kill anyways.
