Water Rune

The Water Rune is an item used primarily as ammunition for staves.

Rune Shrine
Using Unpowered Runes or Charged Runes on a Rune Shrine that is centered on a Water Rune Shrine, will convert those Runes into Water Runes. The player can only convert Runes into Water Runes if their Runation level is 15 or higher.

Mob Drops
Water Runes can be obtained as a drop from the following mobs:
 * Amphibior
 * Blue Guardian
 * Corallus
 * Dracyon
 * King Shroomus
 * Mermage
 * Undead Troll
 * Vine Wizard
 * Vinocorne

Rune Box
Water Runes can be found when opening a Rune Box.

Rune Randomizer
Using Unpowered Runes or Charged Runes on a Rune Randomizer has a chance to convert them into Water Runes.

Ammunition
Water Runes are required as ammunition for the following Staves: Additionally, Runic Sword can consume Water Runes when attacking to slow mobs on hit.
 * Aquatic Staff
 * Coral Staff
 * Crystik Staff
 * Reef Staff
 * Rosidian Staff
 * Water Staff

Banner Pattern
Crafting a Water Rune with a vanilla Banner and a dye will give the Banner a pattern that resembles the Water Rune's symbol.

Rune Templar
Using a Water Rune and Runic Energy on a blue Rune Templar will activate it. This will not consume the Water Rune, only the Runic Energy.