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Guys, the underwater world and underwater battles are just a product of imagination from other games. The heroes already have enough of the Dungeon; I think it would just look out of place to add a new level (underwater). It would be better to create a new type of terrain, something like a swamp prototype from Might and Magic 3. Why invent something new?
Added 2 minutes ago
In my opinion, there's no need to invent anything new. Why reinvent the wheel? Everything good has already been invented. Adding old factions is a good idea. Amphibians, reptiles, etc. - no.
Added 1 minute ago
But why would it be out of place????!! You haven't even seen it yet, and you're already drawing conclusions!!! I'm SURE that with the addition of a new level (even if it's not an underwater level, although I would like it to be), the game would become much more interesting. Although I wouldn't say that it's not interesting now. And simply, there should be water monsters. Why are you sailing across the sea and just collecting chests? You should have to fight water neutrals for them!!
Added 2 minutes ago
What wheel??!! Introducing something old into a new game is called "reinventing the wheel."