World of Al'Dravin
Some rage burns cold.
At 3rd Level you get Immunity to Cold damage, and Vulnerability 5 to Fire damage when Raging. Your melee attacks now do an additional +1d6 Cold damage when Raging as well.
IMPROVED COLD RAGE
At 6th Level you get a Natural Armor Bonus when Raging equal to the Damage Bonus you get while Raging.
At 10th Level if you are hit with an attack that would do Cold damage, you heal hit points equal to half the damage the attack would have done.
HEART OF ICE
At 14th Level while Raging, you know do +2d6 Cold damage with your melee attacks, with an additional +1d6 Cold damage upon making a successful critical.