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I remember ArchWarlock created a mod to add marine neutral creatures, the Ashan - Lords of the Sea, to the game (they replace the Water Elementals from the guardians of the Sunken Temple) - the mod is good, but unfortunately, it conflicts with several mods that affect intelligence, so it's for those who like it.
http://hmmp.ru/load/24-1-0-209But maybe it's possible to extract the creature itself from the mod?