Nice riddle. Okay this one could be tricky, as before I'm gonna try a new style.

In the depths of a valley that watches the stars,
I lie guarding heroes from long ago wars.
My name will not help you I tell you no lie,
To solve this riddle just think what am I?

From cradle to grave the stages divide,
Then one final fight from all others unite.
But what transports the first is the question I ask,
Now remember this too so you can solve this task.

Put your answers together and ask yourself this,
For the clues should now tell you just what your quest is.
Be it high in the sky or deep down underground,
Tell me dear players just where am I found?