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

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At some point, thanks to the HD mod, an old bug with the nagabanks was fixed, and instead of precious stones, they started giving sulfur. A bug from the same category exists with external taverns. In the initial release of "The Restoration of Erathia," visiting external taverns offered different heroes than in the castles (it always seemed logical to me, but I only confirmed this recently by downloading and playing through the campaigns of "The Restoration of Erathia" in the pure form of the first edition). However, later this difference was eliminated by the developers, and as far as I can tell, accidentally (just like with the nagabanks). In my opinion, the difference between heroes in castles and external taverns is quite logical and diversifies the gameplay.