Horn of the Abyss

Horn of the Abyss is an ambitious fan-made expansion for Heroes III, crafted over many years with care that rivals the original. It adds the seafaring Cove and industrial Factory towns, new heroes, artifacts and creatures, a reworked interface and a long list of quality-of-life fixes — all while preserving the exact feel of the classic.

For a great many players, this is simply how Heroes III is played today.