Answer:
In my life I must bare my bloodline I must share.
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
You can drop me from the tallest building and I’ll be fine, but if you drop me in water I die. What am I?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
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. What am I?
It's what light turns into in the night