Answer:
They are toothy nocturnal immortals.
What two letters in the alphabet say goodbye?
The more you take, the more you leave behind. What are they?
It is something you make after you've weighed your options.
What gets wetter and wetter the more it dries?
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.