Wizard Lock

Spell (Celestial 6), Scroll

Eldritch Force; 5 Days
This spell is identical to a Ward spell except that it is cancelled by a Dispel. In all other respects, this spell follows all of the rules for a Ward, including the use of Lesser Investment. If you wish to upgrade your Wizard Lock into a Ward, you must first dispel the Wizard Lock.

The building must be visibly marked with a large “W” to indicate the presence of a Ward or Wizard Lock.

There is no way to tell the difference between a Ward or a Wizard Lock just by looking at it; the only way to tell is to cast a Dispel at the portal and see if it remains. You must have a marshal present in order to do this.
“With Eldritch Force I build a Wizard Lock.”