Answer:
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
This veggie is characterized of long stalks or shoots taken from the plant. They have a strong odor when cooked and can influence the color or urine
A dragons tooth in a mortals hand, I kill, I maim, I divide the land.
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
What is it that given one, you’ll have either two or none?
What covers its face with its hands, speaks no language, yet most known what it's saying?