You are the ancestor god of a new Dawi clan, though actually becoming a Dwarf is optional. The Old Ones once hewed the Dawi from stone, and this power is granted to you as well, allowing you to forge Dwarfs just as Dwarfs forge steel. All the wisdom and knowledge of the Dwarfs is known to your clan from the beginning, so you needn't worry about artillery & Rune Magic being lost arts.
While your Dwarfs are capable of building and maintaining a complex civilization autonomously from your commands, you still have control over your Dwarfs with a power to cause irresistible compulsions, similar to the Dwarfs' pathological need to keep grudges. Your control over them is similar to the control one has in Dwarf Fortress, except that things that would take them out of your control like tantrum spirals or irrational noble behavior are not possible. They're capable of independent thought, and will even gain their own personalities, again in the style of Dwarf Fortress.
You and all your Dwarfs gain a resistance to magic & a long lifespan, with one famous Dwarf canonically living to his 1620th year.