Answer:
What is something you can give away as many times you want without ever losing it?
Whipping one of these out in the wrong setting is said to be terrible luck.
Without what would everyone lose their head?
A tower at the root of all confusion.
Sometimes imaginary and sometimes real, sometimes they are the closest and dearest person outside the family. Who are they?
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.