Since the new Ring mechanics have been applied in patch 4.4 Durin is no longer the Ring hero of the Dwarven faction. The current state of this character is unknown!
The future of Durin is being discussed in this thread on Modding Union.
To see his previous role in Dwarven faction click 'expand'.
Durin the Deathless is the Forefather of all Dwarves. He was the first Dwarf created by Aulë. He lived to be at least 2395 years old (from the Years of the Trees to the First Age).
In Edain mod he is a savage killer, boasting high health and a devastating AOE attack that sends enemies flying. He can take as much damage as he can deal it out.
If the One Ring is brought to a statue of Durin it will resurrect the Mighty Durin The Deathless, Forefather of the dwarves, and he shall once more take up arms against his enemies. He is the ring hero of all three Dwarven Realms.
Level 1: Durin the Deathless - Durin escapes death long after his health points are spent. /Passive ability./
Level 3: Master of Stone - Durin knows every rock in Middle-Earth and also all manners of shaping stone. In a medium radius allied structures are temporary strengthened and enemy structures are temporary weakened. Left click on target area.
Level 5: Word of Silence - Durin speaks a Word of Silence. Enemy units in a wide area become afraid while allies are slowly healed and rank up a level. Enemy buildings within a wide area cannot be used for 30 seconds. Left click to activate.
Level 7: Forefather of the Dwarves - As the first of the legendary seven Forefathers of the Dwarves, Durin is known to all Dwarves and is a source of inspiration. Dwarven heroes in the area gain +50% armor. /Passive ability/
Level 10: Fire of Aule's Forge - Durin the Immortal calls his creator Mahal, the Valar Aule, to his aid. Aule makes the ground of Middle-earth burst into flames by the fire of his forge.
Durin can be used with the rest of your heroes to help them with the +50% armor bonus he grants at Level 7. This, along with the high sturdiness that dwarves normally have makes them a lot harder to kill. However, his high health, AOE and powerful knockback can let him do well without support as well. Durin should be taken when assaulting an enemy base as his Master of Stone can significantly weaken their buildings, making the siege a lot easier. Word of Silence can also be used to prevent enemy interference, replenish your units in the battle, and prevent the enemy from creating more units to fight back. Finally, Fire of Aule's Forge should be used when Durin is in the middle of an enemy army in order to cause maximum devastation.