The strongest castle in Heroes of Might and Magic IV.

Listen, I don't completely agree with you about the factions you mentioned... at least, it contradicts my views on the world of Heroes... Especially, Life being in second place surprised me! :)

On the contrary... Life is a very good faction. Especially the combination of Life and Chaos magic is incredibly powerful. Even with just Life, it shows that it can compete. Plus, the level 3 warriors already have the Death enchantment. And there are 2 archers + angels, who can resurrect themselves. You need to think about it rationally. :)