Answer:
Everybody's got one.
I am the first you ever saw, what greets you every morning and what goes out in the end.
Lovely and round, I shine with pale light, Grown in the darkness, a ladyβs delight.
Whipping one of these out in the wrong setting is said to be terrible luck.
One might hang a locket from this
If you can spot one of these eastern warriors, it means they're not doing their job right.