Summary
The Peapod Necklace is a wearable neck equipment that can be purchased from Amy Thistlewitch at Blackrock Mountain, located inside the building near Blackrock Pond.
Implied by its description, no more words can be said other than "orange to purple, green to red." The center of the pendant resembles a pea pod, as implied by its name. Each of these crystals is used to allow the player to grant access to The Pits Key Door.
The necklace can enhance two things from the player. The first being increasing the player's walkspeed by 1, as well as increasing the player's jump power by 20. Unlike other neck equipment, the Peapod Necklace is able to allow the player to enter a locked door, more specifically The Pits Key Door and only this door.