The strongest castle in Heroes of Might and Magic IV.

The strongest is definitely the Necropolis! Death Knights and Vampires do their job, and Sacrifice is just Super! Although Nature isn't bad either; there's a great choice of units since they have the portal, plus Dragon Power! Chaos isn same behind with its Black Dragons, and as for spells, Cat's Reflexes is simply lovely! Order has weak defense, but if you build mages and genies plus halflings and then Titans, the entire attack will be from a distance! Plus Hypnosis makes it a pretty good combination, but while titans can somehow hold their own in melee, genies and especially mages are complete zeros at that.
Life has crusaders and angels, and decent spells too, and the Stronghold is also not bad if you develop a Might hero to the maximum—he'll turn into a killing machine! And their birds aren't bad, while Cyclops are some of the strongest level 3 creatures! There are many Castles and they are all good, but Death is my favorite!:cool: