From Ars Magica
A mysterious spell that will lead the caster to what is described as "Hidden treasures". Where this exactly leads depends on the type of casting used.
Diminished: Points you at the nearest Mage Tower
Normal: Points you at the nearest Mage Archive.
Augmented: Points you at your mark created using the Mark spell.
If the location type identified by the current casting mode can't be found or doesn't exist, the spell will simply swirl around you for a few seconds.
Castable by Caster Block