Its a expression
"That which does not kill us makes us stronger," was by philosopher Friedrich Nietzsche.
Medusa killed many "someones." With her gaze she could turn people to stone and she made use of that gift.
they are made out of stone
When people made her made she would either kill them or she would turn them to stone. She is very brave, noble, sacred, and strong.
stone
A kind of war hatchet used by the American Indians. It was originally made of stone, but afterwards of iron., To cut, strike, or kill, with a tomahawk.
Stone.
The advantages of a stone keep castle include the inability of burning because the castle is built of stone. It will not rot within a few decades, too.
it is made of stone, hence the word stone.
Gargoyles are made of stone and copper.
Man made stone is known as concrete.
The Rosetta Stone was made in 1799.