Answer:
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat. And your heart grow cold. I visit the weak, but seldom the bold.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
Ripped from my mother's womb. Beaten and burned, I become a blood thirsty killer.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
Often cooked as fillet, this meat comes from an animal that swims underwater.