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I'm making a correction. With Necropolises, the power is equal. But the others are weaker than the Warlock/Necromancer, and here's why:
Phoenix parameters:
HP = 300 + 30 * SP
MinDamage = 10 * SP
MaxDamage = 15 * SP
Attack = 10 + 2 * Hero's Level
Defence = 10 + 2 * Hero's Level
Initiative = 15
Speed = 7
SP grows equally for Necropolis and Dungeon. For the others, the phoenix will be clearly weaker.