RTF is a global modification that replaces all towns in the game.

my vision of this Chaos Dwarfs faction:
Tier 1 - familiars or some kind of fire spirits igniting the forges, like gremlins.
Tier 2 – warriors.
Tier 3 – ranged units.
Tier 4 – something fast, like a rider on magma elementals from Heroes 3 or on rams (nostalgia for the first version of RTF).
Tier 5 - flying units.
Tier 6 - magic users, warlocks, like the ruling class.
Tier 7 - some kind of demonic wonder weapon, like a KDAAI destroyer from Warhammer Fantasy.