Elytra based on wings of Durin's Bane balrog from The Fellowship of the Ring movie.
Vanilla versions don't require any mods, other versions require optifine.
In the optifine version, the elytra has to be renamed so that it contains the word 'balrog', for example : "Balrog's Wings"
32x optifine version
16x optifine version
32x vanilla version
16x vanilla version