1. Winter Warrior was onsale during December of 2014. It unlocks light blue flames on the flame selection and gives you a frost sword, for every kill with the frost sword, you gain more max hp.  It has the same function as a speed coil, except that it can also kill. Winter Warrior also gives you a frost gun that permanently slows and permanently decreases max hp until death down the target. You also get a bit of extra money.