I have one, you have one.
If you remove the first letter, a bit remains.
If you remove the second, bit still remains.
After much trying, you might be able to remove the third one also, but it remains.
It dies hard!
I hover out there in darkness, unseen.
I will shred things to pieces ’till they’re just smithereens.
I might serve as a gateway to places unspoken,
Yet I’m sealed off to man, forever unbroken.
I twist and distort, only darkness escapes,
I destroy all I find
Whatever I take.