How can a monster be strong? It's just... weak. And its defense is weak. Maybe it's strong in the original Heroes 4, but it's weak in Warlords. Regarding Death: "on one hand, it's weak, but an omnipresent devil; on the other hand, it's strong, but not fast enough like a dragon." I won't argue with that. But don't forget about the Champions of Darkness (and it doesn't matter if they are built in a castle or not). It's just too strong compared to a Champion. Moreover, its "Terror" magic, immunity to death magic, and regeneration make it a very serious enemy. Gargantua is in its place, i.e., with Nature. If you move it to Might, the Barbarians will have five level 4 creatures (Monster, Thunderbird, Sea Serpent, Berserk Bull + Gargantua?). Wouldn't that be too much for them? So, dear ZYbr, what do you think about the Dragon King?

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!