Bowl of Water Elemental Control is needed in the quest of Tenya, a worshipper of the deity Umberlee in the area Area North of the Friendly Arm. It was stolen by worshipper of Talos. It needs to be returned to her, but returning it only earns a favor of the worshippers of Umberlee. This favor can be used in the quest related in the Water Temple in Baldur's Gate.