See, if Solution Nine is tied to the civilization of Urqopacha, being a heavily and aggressively expansionist empire originating in a Peruvian-looking region, then a lot of undead would be highly appropriate. What with not just the mummies but that dead rulers were still afforded political power and given taxes, so a fantasy version could very well have actual zombies.

I want whatever is going on in Solution Nine to not be connected to anything else - especially not Allagans (or Ascians). But I will grumble a tiny bit less if it's Mhach just because of the post-patch Void Quests teasing but not doing anything substantial with the Void Ark raid. Just enough to remind players of its existence.

If forced, I would rather have rogue Meracydians if there's an outside group (Allagans, Shards, older non-Turali civilization, etc...) involved to lay the natural foundation for going to Meracydia in a later Expac beyond an Estinien-level excuse of checking off the bucket list.