Hello, and welcome to 'Real Tactics' -- where you [as an Empire General] get to find out other races weaknesses! So far there aren't that many posts, but I have created two to start you off.
Dwarfs -- Dwarfs are especially weak in the magic phase, since they don't have any spells. Use this to your advantage, and cast a deadly spell on his/her general the very first turn with total power [if you get it, some people play that both players have 1 total power card at beginning of battle]. If you manage to kill him, that will send his spirits downhill for the rest of the game. Beware, though, he does have a natural unmodifiable 4+ resistance to magic, though
Dark Elves -- DE are especially weak, toughness wise, so use a lot of cavalry against him. Bring out your knights panther with a Banner of Shielding, along with your general with Potion of Strength. This will prove very useful, trust me.
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