Plot is deliberated by the series experts, the mapmakers have a big experience in their job and the coders do their best to erase all bugs which appear during direct interference with the game code. Instead of parts of various monsters put together, we have units which are created completely in 3D. Instead of graphics from other games or found on the Internet, we have completely new works made by artists themselves.

In contrast to the vast majority of fan projects, in HotA Crew - the team developing the project - there are people who are experts within their field of work. Instead of many innovations which change game to a larger degree and give fans loads of modding functions as scripts language, HotA relies mainly on further game development, that is introducing new units, artifacts or towns with minimal effect on game's mechanics. Unlike the above, Horn of the Abyss is trying to be a classic add-on, recalling original works of game creators, that is Armageddon's Blade and Shadow of Death. Therefore, it can bring to mind another unofficial fan-made add-on - In the Wake of Gods - or one of its many modifications, but the difference is in the project's nature. It's being created completely by fans of the game. Horn of the Abyss is an unofficial add-on to Heroes of Might and Magic III.

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