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The concept I had in mind for an underwater mod was more fantasy (i.e. less high-tech) and had two factions. The first faction is made up of aquatic humanoids and their animal companions, and they live in coral and kelp dwellings. The second is made up of crab people and other invertebrates, and their buildings are cobbled together from scavenged materials.Seafolk troopsWorker (gathers and builds)Spear-fisher (light infantry, fights with a spear)Harpooner (ranged unit, throws harpoons)Triton (heavy infantry armed with a trident, evolves from spear-fisher)Barracuda (fast-attack scout unit)Giant moray (swimming unit, spits poison)Megalodon (swimming unit, giant shark)Trepang (food unit)needs moreSeafolk buildingsCoral Palace (castle)Seaweed Garden (farm, produces Trepang for food)needs moreInvertebrate troopsSlug (gathers and builds)Shrimp (infantry)Crab Man (armored infantry)Nautilus (behemoth, heavy armor and crushing attack)Giant Squid (dragon, swimming unit, tentacle attack and toxic ink)Starfish (self-replicating food unit)needs moreInvertebrate buildingsShipwreck (castle)Conch shell (barracks)Anemone/Barnacle (shoots poison)needs moreResources:Coral (gold)StoneKelp (wood)Edit: Edited for clarity.
EDIT: Erm, nevermind. I just made a complete fool out of myself! Crustaceans ARE INVERTEBRATE.