The Moon Caller's Staff cannot be crafted. Instead, one must place a Star Caller's Staff on a Moon Stone during a Full Moon, after which it will immediately start turning into a Moon Caller's Staff, but also start spawning multiple Werepigs and Hounds that will automatically target the base and attempt to destroy it, in order to stop the progress. Using a nearly depleted Star Caller's Staff will still create a Moon Caller's Staff at full Durability.
A Moon Caller's Staff left in a Moon Stone will constantly generate chilling Polar Light with no added wear on the staff. Haunting a Moon Caller's Staff has a chance to activate it.
A single Moon Caller's Staff can keep players cool through about 6 Summers at the cost of sanity. This, along with the fact that it's portable, makes the Moon Caller's Staff a great asset to players during summer.
A Moon Caller's Staff placed in the Moon Stone will create a permanent Polar Light. This will not decrease the staff's durability.
Care should be taken around the Polar Light, as it can easily cause freezing, even in Summer.