The riddle of the mountain 5
From “The Hobbit”, “Riddles in the Dark”, the third riddle which Gollum poses to Bilbo:
It cannot be seen, cannot be felt,
Cannot be heard, cannot be smelt.
It lies behind stars and under hills,
And empty holes it fills.
It comes first and follows after,
Ends life, kills laughter.
Submitted by Baranor