Answer:
Lovely and round I shine with pale light grown in the darkness a lady's delight.
With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?
Ten men's strength, ten men's length. Ten men can't break me, yet a young boy walks off with me. What am I?
My first two letters say my name. My last letter asks a question. What I embrace I destroy.
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?
Pirates put their booty in it.