I made those changes pretty quick, something like 10 minutes, so I managed to fudge it up it seems. I was renaming and moving stuff around, didn't notice that I changed Like a Rock to a feat. The "You can use Like a Rock as an encounter power" is supposed to be for Shrug it off, not Like a Rock.
I admit I have no experience with Dark Sun, and no nothing of it's story. The thought of a Half-Dwarf has always intrigued me though, and I thought I'd try my hand at helping out. As far as the languages go, I plan on doing something different for my campaign, so the point it moot for me; If they only know common in Darksun, then we should just keep it to common here.
I didn't notice that it said 5'6"-6'2" when I posted it, and I agree it should be changed. Doing some super-rough estimates with dwarf and human heights, I think 5'-5'7" (8" variable)would be a good middle ground between Dwarves' 4'3"-4'9" (7" variable)and humans' 5'6"-6'2" (9" variable).
As far as balancing the racials and the feats, here's what I'm thinking:
Sterner Stuff: If +3 vs ongoing damage seems too much, a drop down to +2 seems okay; that's only 10% more than a normal save. Dwarves, Eladrin, and Halflings all get +5, so +2 should be fine.
Shrug it Off: I put the "failed save does not count as a failed save and has no other effect" for the reason that a failed save can cause worse conditions, regarding things like petrification and sleep. I don't think a player should be penalized for using their racial abilities, so I'd want to keep that aware in the power. We can still change how it reads if it doesn't make sense, as long as its still there (IMO). I made it a free action instead of a Imm Reac since losing your one Imm action to make a save seems a little harsh. To balance the power a bit, we could require the player to spend a healing surge to use the power, and remove "weakened" from the trigger, so that it'll read like this in the end:
Shrug it off Mul Racial Power
Encounter
Free Action - Personal
Trigger: You are hit by an attack that makes you Immobilized, Restrained, or Slowed
Effect: Spend a healing surge. Instead of gaining hit points, You make an immediate save to end the condition applied by the attack at a +2 bonus. A successful save ends the condition, and a failed save does not trigger any effects. If you fail the save, you still make a save at the end of your turn as normal.
You can compare this to the Hobgoblins PC's ability to make a save vs anything as an imm reaction.
Like a Rock: If resist all 1 seems to good for a feat, maybe we could bump it up to Epic tier?
As far as balancing/naming feats, I'm all ears.
I'd be more than happy to make a new block for all this info once we get it all sorted out.