mmmmm by 'ere I'd say Mineral .
that was educational to me as to what not to chose or almost risk killing the game
IT IS:
something that can be seen or heard, both directly, and very much, indirectly.
CLUE: It did not exist before the twentieth century.
*BONUS ANNOUNCEMENT* .. and well done all, because you have succeeded in narrowing this down to a single being without asking the question directly