Bag of Water Eater

This bag contains 1d20 blue sapphires each contains a mote of elemental energy. When you use an action to throw the gem into a body of water, a large blue crystal, standing 20 feet tall with a diameter of 10 ft, all water in a 50 radius is sucked into the crystal, leaving the area dry. Lasts for an hour, after which, the water contained is violently released.

Notes: From Deltora, Consumable