I believe a nightmare mount added to each set of Primals would be a good addition to the game. Currently, there is only a nightmare mount for ARR Primals. Imagine if S.E. added Nightmare versions of each Primal mount to every set of Primals.

Nightmare Lanner
Nightmare Doge
Nightmare Gwyber

I think this would increase the number of current farm parties and give people even more of an incentive to help new people clear old content. Simultaneously, it will also increase the longevity of people playing current content. Thoughts?