Answer:
I follow the orders of only two. I respect the work of only two. I am in constant battles with many, Though one surpassed them all. With forces joined, We created hell, Until our mutual enemy fell. Who am I?
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
Be sure to shout for its answers are weak, but there is no language it cannot speak.
A great mysterious place that the bold have been known to journey into.
What has a mouth but can't chew?
What never gets any wetter no matter how hard it rains?