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Here are a few ideas for Dwarf hero specializations:
1) All water, air, and earth elementals in the hero's army become fire elementals. Also, after a battle, for each Tier 7 Dwarf unit that dies, the hero receives +1 fire elemental for every 6 hero levels. (Brief outline for the bio: a specialist in elemental energy of the fire element. The hero converts elemental energy of other elements into fire energy, and also uses the released energy after the death of dragons to summon elementals).
2) The hero can move between captured mines (conceptually through underground tunnels), losing all movement points, with the distance increasing with level.
3) Increased reward for clearing a treasure chamber, especially if it's already fully scripted (maybe this is more suitable for Orcs). It's been a while since I played, so I might be wrong.
4) Each time the hero levels up, a relic or major artifact is revealed on the map. When picking up an artifact, the hero restores mana and movement points.
This is the first thing that came to mind; I might think of something better and less contrived later.