Storm giant

Storm giants are a type of highborn giantkin native to the Material Plane.

Appearance
Thoonum, a massive storm giant, has deep blue-green skin, glowing white eyes, and its beard and hair are white.

Abilities
The following abilities are all taken from the Monster Manual, 5th Edition, p. 156 and Storm King's Thunder, p. 246. Storm giants are resistant to cold damage and immune to lightning and thunder damage. They also can breathe both air and water.
 * Innate Spellcasting
 * At will: Detect Magic, Feather Fall, Levitate, Light
 * 3/day each: Control Weather, Water Breathing
 * Lightning Strike: In a 10-foot radius of a point within 500 feet that the giant can see, each creature takes lightning damage (half damage with a successful Dexterity saving throw)
 * Thunderous Stomp: All creatures within 15 feet of the giant take thunder damage and are deafened until the beginning of the giant's next turn, unless they make a Constitution saving throw, in which case they take half damage and are not deafened.

Culture
As of 812 PD, with no homeland to unite them, storm giants are the most mysterious of all the highborn. They live solitary lives, keeping no other giant for their neighbor, protecting only themselves and their families.

Background
The storm giants' flying city-state of Tempestar was destroyed by an unknown force in times long past, and all the glories of their realm were cast into the Lucidian Ocean, hundreds of miles off the coast. Centuries have passed since Tempestar was the seat of the Council of Seven Scepters, yet the reclusive storm giants are still considered part of the highborn out of fear of their sorcerous power. The cloud giant kings are particularly concerned with appeasing the storm giants; if unified, the remnants of Tempestar could conquer the flying city of Jovatthon with ease.

The Frigid Depths
As of 836 PD, storm giants had begun blocking the trade routes from Icehaven to Balenpost.

The Lucidian Ocean
Six months after defeat of Cognouza, Thoonum, sent by Uk'otoa, attacked the Nein Heroez, forcing Fjord to hand over the final Cloven Crystal for fear the ship and crew would be killed otherwise. The giant capsized the ship, though most survived.

Named storm giants

 * Sea Dreamer Galadawna: A storm giant leader who attends gatherings of the Council of Seven Scepters.
 * Woden: A demigod of the storm and a former member of the Council of Seven Scepters.
 * Typhoe, the Dreaming Shark: A secluded champion in Tal'Dorei who has risen to the near-divine power of a lesser idol.
 * Eyvindr: A storm giant who gathers cyclops following under his alternative name, Eye of the Storm, desiring revenge on the Council of Seven Scepters.
 * Thoonum: An exceptionally large storm giant loyal to Uk'otoa.