All castles in Heroes 3.

No mage can stand against a warrior with expert magic resistance, especially if that warrior is Crag! And if I only have Dragons in my army? Ha! Mages are weak. Only warriors rule...of course, 3 skill points will have to be spent: 1 to learn 5th-level magic, and 2 on air magic (dimension door) and earth magic (teleport to town + regeneration)...the remaining 5: Attack, Defense, Resistance, Logistics, Rough Terrain...it's possible to exchange the last 2 for Luck + Morale, or Logistics + (Luck or Morale).
You can also give up air magic in favor of Morale or Luck.