Answer:
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
What can be filled with empty hands?
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
Goes over all the hills and hollows. Bites hard, but never swallows.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?