Canon:Istishia

In the Dungeons & Dragons role-playing game, Istishia, also known as "The Water Lord" and "King of Water Elementals," is the Neutral god of Elemental Water and purification.

Publication history
Ed Greenwood created Istishia for his home Forgotten Realms game, inspired by the deity Straasha, created by Michael Moorcock for his Elric stories.

Advanced Dungeons & Dragons 1st edition (1977-1988)
Ed Greenwood initially used Straasha, one of Moorcock's Elemental gods as found in the original Deities & Demigods, as the elemental lord of water for his home Dungeons & Dragons campaign set in the Forgotten Realms. As Greenwood indicated in his article "Down-to-earth Divinity" in Dragon #54 (October 1981), Moorcock's elemental gods "may later be replaced in [his] universe by "official" AD&D beings as these are published". Istishia first appeared in the original Manual of the Planes (1987), and was featured as one of the elemental lords for the Forgotten Realms in the Forgotten Realms Campaign Set's "Cyclopedia of the Realms" booklet (1987).

Advanced Dungeons & Dragons 2nd edition (1989-1999)
Istishia was described in the hardback Forgotten Realms Adventures (1990), the revised Forgotten Realms Campaign Setting (1993) in the "Running the Realms" booklet, and Faiths & Avatars (1996).

His role in the cosmology of the Planescape campaign setting was described in On Hallowed Ground (1996), and The Inner Planes (1998).

His relationships with the nonhuman deities in the Forgotten Realms was covered in Demihuman Deities (1998).

Dungeons & Dragons 3rd edition (2000-2007)
Istishia appears as one of the major deities of the Forgotten Realms setting again, in Forgotten Realms Campaign Setting (2001), and is further detailed in Faiths and Pantheons (2002).

Dungeons & Dragons 4th edition (2008-Present)
Istishia appears in the fourth edition as a primordial.

Description
Istishia's symbol is a cresting wave and his favourite weapon is a wave (a warhammer for his clerics). His domains are Destruction, Ocean, Storm, Travel and Water. He is worshipped by bards, elemental archons of water, sailors and travelers. His clerics can be of Chaotic Neutral, True Neutral, Neutral Evil, Neutral Good, and Lawful Neutral alignments.

His allies are those with a relation to water, like Deep Sashelas, Eldath, Valkur, and Umberlee, but they are not strong relationships. He opposes Kossuth in every way.