Okay, because of the lack of comments i suppose it was too hard?
the answer was: Space (room)
New riddle:
"Everything i devour, plants, tree's, rocks, humans, robots yet i can't be destroyed, only changed."
What am i?
I wish you good luck

The universe has a beginning, but no end. —Infinite.
The stars too have beginnings, but their power accompanies their decline. —Finite.
It the wise who are the most foolish. History has taught us as much.
The fish of the sea know not the world of the land. Were they to possess wisdom, they too would experience decline.
It is more absurd that humans should surpass the speed of light than it is that fish should start living on the land.
- Steins;Gate (anime / visual novel)