Asmodeus' Emerald

Asmodeus Emerald can take any form but is most often a hairpin. Once attuned it can change its form at its master's will every 12 hours. This item is how Asmodeus contacts their 'children' and works as the contract, or brand, that you belong to Asmodeus. If the item is lost, it will return to the master within 15 minutes, if broken, which is nearly impossible, the contract is broken and the wearer will be cursed with the consequences of breaking the contract. 

Notes: Melee Weapon Attack: Poison, Poisoned, The Item takes 24 hours of attunement with the blessing of the Patron, Asmodeus.