Answer:
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
What is it that given one, you’ll have either two or none?
When I get closer my tail grows longer, but when I go away my tail leads the way.
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
What bird can lift the heaviest weight?
What is always coming but never arrives?