For the standard variant, see Vial of water.
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Vial of water (Dungeoneering) detail

A vial of water is used in Dungeoneering to make potions. It is created by using a vial on a water trough, which can be found in the starting area or in other rooms. If a herb is used on it, it will become an unfinished potion, and a secondary ingredient must be added to create a functioning potion. A vial of water (o) is also used in the enigmatic hoardstalker puzzle.