Answer:
I am in truth a yellow fork from tables in the sky by inadvertent fingers dropped the awful cutlery. Of mansions never quite disclosed and never quite concealed the apparatus of the dark to ignorance revealed.
I am used when you jump off a bridge for fun.
As a state in America I am round on both sides and high in the middle.
Men seize me from my home tear apart my flesh drink the sweet blood then cast my skin aside.
I am an odd number that become even when beheaded.
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.