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

I would categorize the spells like this (most of this correlates with Heroes of Might and Magic III):
Fire
Armageddon, Berserk, Blind, Firestorm, Fireball, Retribution, Curse (Weaken), Vengeance

Even worse! What are Retribution and Weaken doing in the fire spells? No, it's better as it is.
Vampirism doesn't really fit in any category...