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Pyromancer is a decent class, but I would make it based on a Knight or Death Knight, not a Sorcerer, and it would need a regeneration ring (armor) or a Vampiric Amulet, as well as a health ring; otherwise, the shield won't be very useful.
Fireguard – I wouldn't say this class is that good; there's a potion for fire resistance, Warfare is okay, but one Chaos magic spell doesn't always solve the problem.
Fire Elemental – I don't see the point of it when Archmage exists.
Warlock – In my opinion, it's one of the best classes against living opponents, but for greater effectiveness, it requires artifacts: Dagger of Sorrow (or Scroll of Woe), Griffin Helmet, and a crown (that negates immunity to fear). In the Spazom Maticus campaign, at level 5, I single-handedly defeated 100+ griffins, but I don't consider this class the best in this ranking.
Heretic – On the one hand, ignoring protective auras is a big advantage; on the other hand, who has a Chaos aura when we're talking about a Sorcerer? Only the Titan, so this is a highly specialized class against Titans – not very impressive, is it?
Wizard – I think it's the best class in this ranking (yes, Order magic is difficult to learn, as are the skills and spells, but with a set of assembled artifacts from Armageddon's Blade, it will have Order and Chaos auras, fire and cold resistance, and a magic mirror; it doesn't even need magic resistance).
Lich – Old age is powerful, but it doesn't work on everyone, and the undead body makes it a questionable choice.
Dark Knight – If it regenerated mana in combat, it could compete with the Wizard, but in its current form, I think the class is useless.
Archmage – Again, I'll repeat that this class stands on a separate level of skills.