Posts from Let's come up with an amphibian race!

We also need to sort out the balance and parameters of all creatures.

I suggest the following: For land units to descend underwater, they need to obtain a water sphere (or gain the Diver skill). While underwater, they have a penalty, but an expert Diver eliminates it. Amphibious units can emerge onto land by obtaining an earth sphere (or gaining the Land Walker skill). While on land, they have a penalty, but an expert Land Walker eliminates it. All units travel across the surface sea on a ship (its chemical composition differs from the underground sea, so amphibious units cannot travel on it without a ship).

Why do such a thing? It makes everything much more complicated. If the seas aren't connected, there's a story for that, explaining why amphibians sail on ships. Although, if you want, we can start over.

What’s the difficulty here? These are different seas. One is a sea, and the other is a sea. We can make it so that the density of the water in the underground sea is higher, allowing the Garray to move across it as if it were land, while only Krakens can swim freely in the surface sea; the surface sea is too thin for others, and they are pulled back down into the depths. Or, we can make it so that the Garray have lived in the darkness of the underground sea for so long that they need protection from sunlight when moving on the surface (including in the water) – a ship.

If the seas aren't connected, then the optimal solution is to have a different chemical composition for the surface and underground seas. For the Gar'goyles, the surface sea is like acid. And the underground sea would be normal water for them.