Under certain conditions, such as the smell of blood, under the light of the full moon or when wounded enough to suffer impairments, you go berserk. You will go absolutely mad, killing indiscriminately and heedless of your own wounds. This means you will not try to escape and won't use tactics beyond a mindless charge against the most obvious opponent, thus taking extraordinary risks. You will not attack friends unless you also have Murderous Rage.
If you always suffer this limitation in combat, it is worth two limitations.