Qwerty
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Efreet Sultans are indeed strong units.
Here are their advantages over Nagas and Dark Knights:
1. High speed.
2. Ability to traverse obstacles.
3. Fire shield (which often causes trouble).
I would also add immunity to fire magic. At the beginning of the game, immunity to ranged attacks is very useful, and if you find Armageddon, it's even better!
Орден Феникса – харизматический :) лидер