Answer:
Up on high I wave away but not a word can I say.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
What looks back but cannot see?
Long and slinky like a trout, never sings till it's guts come out.
What is put on a table, cut, but never eaten?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.