Bow of Eros

Origin
In Greek mythology, Eros, whose Roman counterpart was Cupid, was a god of love and lust, whose arrows could both make a person fall in love and hate. Some accounts see him as a primordial god, while others see him as a son of Aphrodite.

Effects
Anything fired from this arrow that pierces the skin of a living organism will cause the victm to fall in love with the first person they see.