Air

Air is invisible

Air is invulnerable

I walk around in the world where a hidden force can hit my body without killing me or it

Air is kills

Air is needed

I walk around in the world where air can kill me if mixed wrong but gives me life if mixed right

Air is anywhere

Air is nowhere

I walk around in the world where air is always there except when it is not

Air is focus

Air is wild

I walk around in the world where you can focus your breath or let it be free when you run

Air,

Luft,

Aire,

Luft is just some of the words we use for something we cannot see but depends on