This page need adjust. Orbs are item that came with version 4.0, it boosts witches speed.
Orb is new function that came with ver 4.0, used for boost witches's ability such as speed for limited time, called Evolution.
Its effect can be improved by Level up witches.
In first time, you can obtain only 3 orbs. After you use one, orb will regenerate but you can also use Crystal to recover it to maximum.
Remember to use Orbs on Witches to gain Treasure Boxes (Normal Treasure Box and Luxury Treasure Box) in order to upgrade Witches. The more you Upgrade the more time your Orbs will last on Witches!