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

Regarding the sulfur in Naga banks – it’s debatable IMO, everyone is already used to the fact that there’s sulfur there. However, for gameplay, it’s definitely a plus; there will be something to upgrade the Tetranoffs with. And here’s a HUGE thank you for THIS:

[!] now any battle plays out identically upon repeated attempts after loading a saved game and performing the same actions.