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

to avoid naming each unit according to the formula "ashy/fiery + [unit name]", we had to get creative – the ifrit became the infernal (but there were other plans for that name), and the upgrades received names derived from the Latin words for ash and fire.

SPELLS – the first unit casts combat spells: fireball and wall; the upgraded version has meteor shower and a large mana pool, and the alt-upgrade has ONLY the summon phantom ability.
and each of them has soul drain.