The Hourglass is a splash potion that teleports the player back to location in which they threw the potion after a period of time. The time is dependent on the amount of sand blocks put into the Hourglass up to a total of 15 sand blocks. Sand blocks may put into the Hourglass's charge menu using the left mouse button.
The Hourglass belongs to the Watson collection and does not have a prerequisite to unlock it's recipe. The Hourglass does however have a cheap cost to craft requiring:
The Hourglass is useful for trying to accomplish a specific objective in an area with lots of mobs and/or is dangerous and may result in death, this is because the player can use the hourglass where they are, run into the dangerous area, and get teleported out.
The Hourglass might have pvp applications based on the amount of time before the teleport happens. The teleportation effect may allow the player to get back to an advantageous position, create confusion, or use it as a quick recovery.