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In the poll for the strongest level 4 castle creature, the black dragon is the clear leader; its stats and skills are impressive, but I think it has at least three worthy competitors.
1. Phoenix: Two phoenixes have the same stats as one black dragon, but they have higher speed, can be reborn, and can receive buffs, such as Dragon Strength, which makes the phoenix as strong as the black dragon, while the stat increase is twice as high.
2. Bone Dragon: Two bone dragons are even slightly stronger than one black dragon, but they also have double resistance to ranged attacks and can inflict fear. Fear affects everyone except the target, the bone dragon itself, and the dragon golem. This resistance gives a significant advantage against ranged attackers, and considering that in Heroes 4, ranged units attack in a straight line, this is a huge advantage. These two skills combined make the bone dragon one of the best units for assaulting castles. Furthermore, with vampirism buffs, bone dragons are like vampires, but their stat increase over a week is 2-3 times higher.
3. Titan: A ranged unit that doesn't suffer a penalty when dug in, and the only castle unit with this kind of skill. In addition, its Chaos Ward is effective against all Chaos units, as well as Chaos magic, which is used by the Sorceress from Order and the Magic Dragons from Nature. When playing as Order, the Titan's attack can easily be increased from 32 to 50 thanks to the hero's accuracy buff and the Djinn's Zeal buff. Furthermore, there are two artifacts for the Titan that allow it to deal double damage to black dragons when firing. The first is the Elven King's Bow, which gives an additional ranged attack, and the second is the Sling of David, which gives ranged units double damage when attacking level 4 creatures. But that's not all; when placed on a tower, the Titan receives double attack and defense values.
