Answer:
An open ended barrel, it is shaped like a hive. It is filled with the flesh, and the flesh is alive!
Left to right Iām quite bright. Right to left I might bite.
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
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?
It's what light turns into in the night