Brothers and sisters, many of you are aware how things work in fellow mmo: SWTOR. Sith Warriors and Jedi Knights use the same abilities but their names and animations differ.
Void Elves are a perfect chance to introduce Void based Paladins, using black/purple and blue instead of white and gold. Twilight warriors of previous expansion, Cataclysm, were such beings in all but themed effects.
This would open many great possibilities, such as arcane infused druids.