Answer:
I am the red tongue of the earth, that buries cities.
He died for people's entertainment.
These are believed to be found at the end of rainbows
What can you hold in your left hand but can never hold in your right hand?
In many hallways you would stand, if not with this in hand.
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.