The Ash Warriors are an elite unit of fighters who use vicious Mabari War Dogs in battle. They are found in Ostagar before the Battle. You can talk to them, but you will gain nothing.
The Ash Warrior's training has been passed down since Luthias the Dwarfson first harnessed the battle-rage of the dwarves. Ash Warrior's follow the battle-rage inside, nurture it, and draw it out so they cannot fall in battle until their last for is slain. Ash Warrior's trusts their hounds with their life's, as the hounds do them, and fight side by side with their hounds in battle.