Agony

A translucent glass bulb with steel crafted around the top of the bulb coming to a needle like point at the top. 

The necklace hangs lose on a black chain that hangs losely around the wearer. As a bonus action you can push your finger onto the needle dealing 1 point of piercing damage 

The next evocation or necromancy spell you cast does an extra 3d4 damage 

Or 

If a opponent music make a saving through it raises the DC by 2 

Can be used 2 times per long rest 

Notes: Damage, Necklace, Jewelry