Alkin:Alkin is a powerful Fortress hero, capable of both offensive and defensive actions. His ability is also very useful when you have a large Gorgon population.
Andra:Andra has an odd specialty for a Witch, Intelligence. This both makes her one of the best Fortress heroes, and one of the best spellcasting heroes in the game.
Broghild:Brogchild is an average Fortress hero. His specialty increases the power of Wyverns, which is great. But his Scouting is really bad.
Bron:Bron is an average Fortress hero, though his specialty may be useful in small maps.
Drakon:Drakon is a good Fortress hero in small maps because of his Leadership, his specialty however does not really allow him to be more than average in larger maps.
Gerwulf:Gerwulf is a good garrison hero and may even be used in offensive actions in small maps because of his Ballista.
Korbac:Korbac is very useful in small maps because his specialty increases the (already high) speed of his Serpent- or Dragon Flies. Pathfinding is a second advantage in many maps.
Merist:Possibly Merist's Learning could be an advantage in small maps, but otherwise she's an average Fortress hero.
Mirlanda:Her Advanced Wisdom makes her a slightly above average Fortress hero, but her specialty is not good at all.
Rosic:Rosic is a below average Fortress hero because Mysticism is so bad.
Styg:Styg is one of the better Fortress heroes. Her specialty increases the damage of her spells greatly, which makes her one of the most feared offensive spellcasters in the game.
Tazar:Tazar is one of the best Fortress heroes because his skills and specialty are completely focused on defense. He is also the best defensive hero in the game.
Tiva:Tiva is one of the worst heroes in the game.
Verdish:Verdish is an above average Fortress hero, her First Aid specialty makes her an interesting garrison hero as well.
Voy:Voy is the Navigation Witch, very useful in maps with lots of ocean, otherwise she's a below average Fortress hero.
Wystan:Wystan is an average Fortress hero.