Answer:
I go through a door but never go in and never come out.
What begins with an E but only has one letter?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
I cannot be other than what I am, until the man who made me dies. Power and glory will fall to me, only when he last closes his eyes.
I am the word that is always spelled correctly by everyone.
What made Cyclops quit teaching?