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Naga are a repeat of Heroes 6; it's better to come up with something original instead of borrowing from somewhere else. I suggest creating a race not of lizardmen, but of Atlanteans.
We can assume that the Atlanteans, like the dwarves, are peaceful and didn't intend to interfere in any wars. Or perhaps they simply didn't know that anyone existed on land. However, if we think about the history, there could be some kind of biofuel in the depths of the sea, and, for example, mages might want to extract it, disturbing the Atlanteans, and thus starting a war.
As for their appearance, I think it would be better to rework the lizardmen from Heroes 3. I've already drawn some sketches for them, but I must admit, I'm not very good at imagining the city, and I'm no architect.
We can assume that the Atlanteans, like the dwarves, are peaceful and didn't intend to interfere in any wars. Or perhaps they simply didn't know that anyone existed on land. However, if we think about the history, there could be some kind of biofuel in the depths of the sea, and, for example, mages might want to extract it, disturbing the Atlanteans, and thus starting a war.
As for their appearance, I think it would be better to rework the lizardmen from Heroes 3. I've already drawn some sketches for them, but I must admit, I'm not very good at imagining the city, and I'm no architect.