Diamond horseshoe

Lucky is the homeowner who owns this smooth curve of gemstone brilliance, as dropping the diamond horseshoe in one's home conveys a swathe of magical puissance effecting the following protections to all current rooms in the owner's house:

• eye sigil
• monolith sigil
• key sigil
• no prism

The horseshoe's dedication is impervious; it cannot be removed once placed in the home, though it can be touched once to update its coverage to any new room additions.