Your blood turns sluggish without sufficient heat, and you must seek warmth and shelter earlier than most.
You take a –4 penalty on saves against cold spells and effects, and whenever you fail such a saving throw, you are staggered for 1 round. You can survive without food four times longer than a typical creature of your species before you begin to starve.
At 5th level, poisons affecting you have their onset time doubled and last half as long if they end after a set time (for example, a poison with a frequency of 1/round for 6 rounds would instead have a frequency of 1/round for 3 rounds). Poisons with no onset time gain an onset time of 1 round. At 10th level, whenever an action you have readied is triggered, you can take an additional move action at half your speed—along with your readied action—even if you have already taken a move action that round.
At 15th level, you can take an additional move action a number of times per day equal to your Charisma modifier. You can take these additional move actions only on your turn, and can take only one of these extra move actions per turn.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.