Amulet of Protection

Could also be made into a ring.

Recipe
Grind the sap of the kronnic tree into a powder no greater grain than the mote of sand. Place the threads of harpy hair lengthwise upon a block a stable ferrionia. Pour over 500 drams of purest spirit... perform the incantation of protection whilst boiling the mixture until the threads dissolve. Thus obtained, the harpy's ink must be applied directly to the device which is now neither as hot as a brilliant sunset, not as cool as the dimmed sun over the ocean. The formula must match the incantation precisely or shall be ineffective, lest you discover this flaw under the talons of a ghoul!