Shield Cement

A sub-type of Whitestone. If processed correctly through secret, clarainian means, the properties of Whitestone that strengthens it above the usual hardness of regular stone can be filtered out to allow anti-transportation magic to be enchanted into the very foundations of the stone.

Should a mage attempt to teleport to the other side of a thin piece of Shield Stone, their magical travel will halt on their side of the piece. This product has made Clarain a major player in the economic geography of the Empire.