Middle Earth Riddles: The Terror Continues

[Nuranar]

Thanks so much for starting a new thread, Kalimac!

I figured I'd re-post my riddle for your convenience:

Soft, heavy, or hard:
Found not in a lie
Yet everywhere am I
Shun me and you die...
Soft, heavy, or hard.

And here's a hint:
Think literally and use idioms.

I welcome any and all guesses!