Answer:
It stands upright and can be quite grand. Its secret is not hidden but right at hand. What is it?
What has a single eye but cannot see?
What has a head, a tail, is brown, and has no legs?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
If you can spot one of these eastern warriors, it means they're not doing their job right.