Answer:
It is able to speak because it has a hard gone. You know what it is as soon as it has sung. What is it?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
It is more feared than fear itself, And no one can escape it. It takes no sides and does not judge, it does not know to hold a grudge. It is the most clearest result, Of how life beats you by default.
What is it that was given to you, belongs only to you. And yet your friends use it more than you do?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?