Great Duelist Pack is a small expansion for Might and Magic: Heroes 5.5 (a global modification for Tribes of the East) that is aimed at adding over 50 new battlefields to the game. The arenas are available from any section of the game (campaign, hotseat, duel mode). The pack brings brand new arenas but also includes good old classics, namely:
New Arenas+ (Zenithale & co.): http://heroescommunity.com/viewthread.php3?TID=28380
ER Arenas (Erythrocytosis): https://forum.heroesworld.ru/showthread.php?t=11043
You can download the pack using one of the links provided below:
https://www.moddb.com/games/heroes-of-might-magic-v-tribes-of-the-east/downloads/might-magic-55-great-duelist-pack
A word of caution: the pack is optimized for M&MH5.5, implying backward compatibility as possible but not guaranteed! If you want to play the vanilla version of the game with this mod, you will most likely encounter various visual glitches and grid misalignment due to the increased size of battlefields, introduced in M&MH5.5.
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Bon Journée