This is an example of a brown bear mutated by the influence of the Blight. There are many variants, however,  this particular strain (spiny grizzly) has developed tough spines along its body and mottled, green-brown fur over its yellow-brown skin. It has also developed the bloodlust common to all creatures of the Blight, generally attributed to their proximity to Shayol Ghul.

The mutant brown bear resembles, and follows the patterns of, a typical brown bear. However, it is quicker to anger, more predatory and more territorial than its common brethren, and will fight to the death if challenged. The creature is large, and denser than the more common brown bear, sometimes weighing nearly a ton and a half. A rearing spiny grizzly can attain heights as great as ten feet.

Combat: The spiny grizzly fights with a terrible strength, enhanced by its bloodlust, increased strength, dexterity and its hardened spines, detailed below. 

Bloodlust (Ex): The creature is such a ferocious and terrible opponent that it will continue to fight without penalty even while disabled or dying.

Spines: The creature has one or more layers of spines on its body that it may bring to bear in combat or when enraged. Whenever an opponent makes a successful strike in melee combat, the creature may make a free attack of opportunity with its spines (Base attack Bonus) that does 1d6 + 6 in damage.