Answer:
I can be swallowed But I can also swallow you.
What language does a billboard speak?
What is always coming but never arrives?
Draw fire or fill me; I'm still empty.
Sometimes dark and sometimes bright, I make my way among twinkling lights. Seas and oceans obey my call, yet mountains I cannot move at all. What am I?
If you can spot one of these eastern warriors, it means they're not doing their job right.