Answer:
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
I've been around for millions of years, but I am no more than a month old. What am I?
Who is your mother's only sister's son's brother's aunt's daughter's sister's father?
I direct you from outer space.
To cross the water I'm the way. For water I'm above I touch it not and truth to say I neither swim nor move.
It weighs next to nothing but no one can hold it for long. What is it?