According to Poxbase: Warchief: Storm Clan - This unit has Iron Will. At the end of your turn, this unit gains one rank of Skylancer (up to 3). If this unit dies and there is no other Storm Clan Warchief, the next nearest Barbarian becomes the Storm Clan Warchief. 2 nora! Iron will: This champion cannot be Charmed,Possessed or Distracted 4 nora! Warchief: Storm Clan is half the cost, 2 nora, giving Iron will (that costs 4 nora it self) and also giving upto 3 ranks of Skylancer and can be given to another friendly unit. Shouldnt Warchieft: Storm Clan atleast cost 4 nora or more? Since it gives an ability worht 4 nora. Are there more abilities like this?
Stone clan is a racial ability that's why. Iron will is probably overcosted though considering how rare charm and possess are.
Pretty much what DMR said -- other racials have some less tangible cost, such as BG construction or board position. The only cost for the warchief abilities is their nora value.
This is not about "clan" abilities themselves, but the fact they give one ability worth 4 nora for 2 nora + something else. I dont see how one ability giving another can cost less then the ability it gives.