The weakest castle in Heroes of Might and Magic IV!

There are many useless buildings: stable, abbey

Stables provide +5 movement points per week, which is an additional bonus.
The abbey increases morale by 2. Morale in battle grants the right to the first move and increases the damage of troops.

Weak magic: healing spells are weak

Bless, Prayer, mass exorcism, and various protective spells. At the beginning of the game, it provides healing, bless, and armor. This school remains relevant throughout the game. In addition, it also includes the overpowered Endurance spell.

The only significant drawback of Life magic is the very expensive construction of angels. And it also takes a long time, as it's not very desirable to place monks.