there is very little as far as I can tell - the areas were sketched out in 3.5e material as a bare-bones overview but not much wirtten in detail (nor any statblock) leading to many homebrewed versions
@Cleon
These are the two most informative post I have seen about the Dodking:
- Forgotten Realms Wiki: Dodkong
- Sage Advice: What is the Dodkong's Goal
But as
@Casimir Liber stated, no stats for the Dodkong or the Crown.
So all we know about him is the Underdark info that he's a lich and 10th level sorcerer whose
crown of Obadai is a stone giant artifact with undefined powers over the undead?
Well not completely undefined. It can turn a stone giant into a lich and can be used with "ancient giant rituals" to create Dodforers (literally Death Chiefs), a "special kind of undead stone giant" whose stats are even less defined than the Dodkong.
At least we know the Dodkong is a sorcerer lich which has a template in 3E!
The only game rules we have about Dodforers is that there's twenty of them in Cairnheim village and their chief, Koenig Serpentspine, is a male undead stone giant ranger 9.
ADDITION: The
Grand History of the Realms entry for 160 DR Year of the Stone Giant has:
A cairn (undead stone giant) called the Dodkong, or “King of Death,” appears from the dark below. On his arrival, he gathers the stone giant clans and refounds the kingdom of Nedeheim as Cairnheim.
There is an undead stone giant called a Cairn in 2E AD&D in
Giants from the Grave by Gregory W. Detwiler from
Dragon #254 (December 1998).
The traits of that undead giant are a bit different from a Wight though: they don't have a draining touch and are much harder to damage with weapons (
+2 or better weapon to hit) and somewhat better AC than a living Stone Giant. Two points better to be precise (AC 0 vs –2).
They do have an interesting telepathic ability:
Cairns have a keen telepathic sense that enables them to tell when someone comes near even when that person is silent and/or invisible. They make good use of this when waiting for victims in ambush positions, closing their bright, betraying eyes and blending in with the rocky background until the intruders come close enough to attack. Because of the giant’s stony appearance, victims have a –5 penalty to their surprise rolls when they encounter a cairn underground. Often the first hint of trouble is when large boulders start whizzing past them
Maybe do something with that?
Apart from that, they're a hair tougher (HD 15 instead of 14 +1-3 hp) and do more damage (2d8+9 weapon instead of 2d6+8 weapon, 3d12 rocks versus 3d10 rocks) and for some reason can chuck rocks a bit farther (350 yards, 50 more than a 2E stone giant's 300) but are too clumsy to have
Rock Catching.
Oh, and they have the standard undead immunities and are unaffected by cold- and earth-based attacks (apart from a couple of earth spells which soften their skin for 10 rounds:
rock to flesh makes them AC 0 (2 points worse), while
rock to mud makes them AC 7 (9 points worse!).