Duergar!!!! Underdark Dwarves
1. They already have the graphics in game.
2. Duergar's Enlarge ability is in game with Undying Vanguard from Unyielding Sentinel. Make the ability like a barbarian or Shifter rage but with the larger frame.
3. In the racial enhancement tree add ways to enhance the Enlarge ability: Duration, Str, Con. Also this would be a great place to work some more under used weapons such as the maul and the heavy pick. Maybe top tier gives maul +2 Crit range and +1 Crit range to heavy picks.
4. Racial TRs could provide a 2nd +1 STR race.
5. We have 3 types of Elves and 2 types of cat races. We need some dwarven balance!