Once, I was honored as a bringer of wisdom, but am now feared as a stealer of strength.
Men shudder at my approach. Yet if they knew that they would never see me, they would cry out in anguish.
I have a foe, against whom I seek to protect mankind. But he is the stronger; I cannot protect all from him, and even those I guard will eventually fall to him.
Who is my foe?
And who am I?