Moon Stick is an attack item.
The Moon Stick is used by Sailor Moon to perform Moon Healing Escalation and its possible to put Silver Crystal on it. The Moon Stick was previously owned and used by Queen Serenity and can be used only by descendants of Moon Kingdom.
The Stick is made from pink material with crescent moon on top made from crystal.
In the final battle with Queen Metaria, the Moon Stick became a long staff. When Usagi received her Crystal Star, Sailor Moon used the Moon Stick to destroy Queen Metaria and revive the people of the Earth. The Moon Staff vanished and was never seen or mentioned again.
Later the Cutie Moon Rod replaced the Moon Stick