Argitoth:
I didn't mean to anger you. Different tone might make people more eager to accept your ideas, including me, and that's why I said what I said. I used aggravation, but I meant irritation or annoyance, something that isn't a big deal even for me.
The concept of water and blood not working together (which wasn't yours) also irritates me. There are no underwater blood spells because the (formerly) human blood slaves drown underwater, and that's all there is to it. Leech, Leeching Touch and Hellfire don't require Blood Slaves, and work fine even under water. It seems all blood rituals are limited to just dry land, though.
My anger management issues aside, LA Mictlan is indeed Blood/Water nation with some capability of going underwater.
Sombre also had plans for a LA Oceania with Blood and unique underwater blood spells.
This happened almost a year ago, though, and while Sombre has been busy modding I don't remember him working on this since. Some people in the old thread really liked the idea of inhabitants of the depth coming to dry land to hunt for human blood, while others don't see any mechanical reasons for not being able to find slaves under water.