Artemis

Yuki Cross's magical anti-vampire weapon. When touched or wielded by vampires, it will react against them. It normally compacts into a short rod and extends when Yuki uses it in battle. Yuki carries it hidden under her unifrom strapped to her thigh.

Artemis Scythe
The first time Yuki picks up the Artemis Rod following her transformation back into a vampire it tries reject her but Yuki persists in spite of warnings from Kaname and it transforms in to a scythe. It is unknown whether it compacts as it used to when it was still a rod or whether it reverts to its original form when Yuki is not in battle.