Answer:
I travel the world and I am drunk constantly. Who am I?
A standard dimension for sandwiches and rulers
I am not alive, though I never die, to no one I've ever told a lie, today I can be god's warrior, and serve him with no horror, but tomorrow I might be devil's knight, for I am what ends the light.
You feel this sensation when you are dehydrated.
It can be clear like water, but it burns like fire.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.