Answer:
What starts with an "e" but only has a single letter in it?
Tear one off and scratch my head, what once was red is black instead!
Barren location, infertile and dry; my name means "to leave", it's not heard to see why
One am I, among six others: Largest, smallest, cold, dark and two brothers
What is something you will never see again?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.