The Supreme Cube

It's The Cube with its missing piece. When using it, two things may happen: If you don't have a battle sign, you can enter it, as long as you have the quest requirements. You can then use it again while inside, and you will be teleported to Gray Beach. This is very useful as a free teleport out of almost any location. It is advisable to relog first and then quickly use the Cube, this way you won't get any damage from the Planedwellers. If you're inside a House you own and have defeated the Planestrider, you can also Sleep (and offline train), but only once every 48 hours. When you do that, it will change into The Supreme Cube (Small). There is a 2 hour cooldown to use the Cube, regardless if you accessed the Cube dimension or slept. Part of the Opticording Sphere Quest.