HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Regarding the PvP Neutral Combat, I tried it, and it's fun. But it should limit the time for each neutral unit's turn to no more than 10 seconds; in Heroes of Might and Magic V, this is called dynamic combat. Otherwise, you might encounter an unscrupulous player or someone who is simply slow, which can turn the game into a nightmare. I didn't notice if there was a timer for the player while they were thinking about the "neutral" unit. I was too engrossed in the game :D.