Answer:
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
This is rectangular, hollow and has a lid, and where you’ll find it you might wonder, it is just six feet under. What is it?
What holds names and memories which are not its own?
What is as big as you are and yet does not weight anything?
If lightning strikes an orchestra who is the one most likely to get hit?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?