He's probably closer to Shalassa. Although, the idea of sea demons seems interesting to me, even if it's not very logical.
Added 3 minutes later
Yes, but they have different formulas for the same ability. So, it all depends on where and how this is controlled, and whether it is controlled at all.
Black captains (guards)? Or some other minor officer rank... Black lieutenants, perhaps...
Regarding the captains/lieutenants, it's not a bad idea.
Added 2 minutes later
Corporals, perhaps? Or "black warrant officers"?
Added 2 minutes later
But in general, "sergeant" would probably be the most appropriate, considering that there could be about 40 of them in some neutral squad guarding a sawmill. And it's strange when 40 captains guard sawmills alone. With sergeants, it's still a bit strange, but much less so.
Added 2 minutes later
Another question. Should creature names in the game be written in the singular or plural? Like "black guard" or "black guards."
In English, it seems to be in the singular, but in Russian, it creates confusion.