I can tell you more about each one if you're interested!
Holy Alliance (Western Humans)
Style – Greco-Roman architecture combined with Western church architecture. Favorite magic – Light.
Inspired by Heroes 6.
Main inhabitants of lowlands.
Strongest creature – Angels.
Sylvan (Forest Elves)
Style – Druid architecture combined with elven mythology architecture. Favorite magic – Earth.
Inspired by Heroes 5.
Main inhabitants of high forests.
Strongest creature – Forest Dragons.
Order of Necromancers (Undead)
Style – Ancient Egyptian architecture. Favorite magic – None.
Inspired by Heroes 6.
Main inhabitants of wastelands.
Strongest creature – Fate Weavers.
Legions of Chaos (Demons)
Style – Absolute chaos. Favorite magic – None.
Inspired by Heroes 6.
Main inhabitants of the underworld.
Strongest creature – Devils.
Academy (Mages)
Style – Arabic architecture. Favorite magic – None.
Inspired by Heroes 5.
Main inhabitants of northern deserts.
Strongest creature – Titans.
Stronghold (Northern Orcs)
Style – Mongolian architecture. Favorite magic – None.
Inspired by Heroes 5.
Main inhabitants of taiga.
Strongest creature – Ogres.
Fortress (Dwarves)
Style – Scandinavian architecture. Favorite magic – Fire.
Inspired by Heroes 5.
Main inhabitants of northern mountains and dungeons.
Strongest creature – Fire Dragons.
Warriors of the Storm (Eastern Humans)
Style – Old Slavic architecture. Favorite magic – Air.
Inspired by the mythology and culture of Eastern Slavs.
Main inhabitants of high plains.
Strongest creature – Eastern Serpents.
Stronghold (Island Orcs)
Style – Aztec architecture. Favorite magic – None.
Inspired by Heroes 6.
Main inhabitants of islands.
Strongest creature – Cyclops.
Sea Guardians (Nagas)
Style – Japanese architecture. Favorite magic – Water.
Inspired by Heroes 6.
Main inhabitants of seas.
Strongest creature – Kirins.
Dungeon (Dark Elves)
Style – Gothic architecture. Favorite magic – Darkness.
Inspired by Heroes 6.
Main inhabitants of southern mountains and dungeons.
Strongest creature – Underground Dragons.
Swamp Dwellers (Lizards)
Style – Chinese architecture. Favorite magic – None.
Inspired by Heroes 3 with some changes towards Chinese culture.
Main inhabitants of swamps.
Strongest creature – Hydras.
Machine Builders (Technicians)
Style – Steampunk architecture. Favorite magic – None.
What can be created in Heroes based on steampunk.
Main inhabitants of mountain wastelands.
Strongest creature – Tank.
Brotherhood of Barbarians (Desert Orcs)
Style – African architecture. Favorite magic – None.
Inspired by the idea of combining orcs and African tribes.
Main inhabitants of southern deserts.
Strongest creature – Sandworms.
Army of Mor (Goblins)
Style – Chaotic combination of architectures. Favorite magic – None.
Inspired by Dragon Age, Lord of the Rings.
Main inhabitants of lower dungeons.
Strongest creature – Abomination.