Artemis' Bow and Arrows

A weapon of unknown make and origin, they were wielded by Artemis, Goddess of the Hunt.

Powers
Similar to her blade, they were capable of killing Immortal beings such as Gods. Though her intention was kill her father Zeus, she ended up killing both Zeus as well as Prometheus with them.

Appearance
In Remember the Titans, Zeus was summoned by the brothers to lift the curse off Oliver who was Prometheus' son. But Zeus turned the tables and tortured Prometheus and was about to do the same to Oliver. Artemis refused to be a part of such barbaric act and resolved to kill her father. As soon as she let an arrow fly, Zeus pulled Prometheus into its path. It struck Prometheus.

Wanting to end his son's suffering once and for all, Prometheus sacrificed himself by pushing the arrow deeper within himself, thereby even impaling Zeus who was standing behind him. With Zeus' death, the curse was lifted off the boy.