Answer:
A word I know, six letters it contains. Subtract just one and twelve remains.
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.
Once they sailed the sea, now they surf the web
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
I stay where I am when I go off. What am I?