You can summon an army of the dead to fight for you, hold Strong Attack (A) for 5 seconds, then press Weak Attack (B) while still holding A.
Legolas's Special Ability
Hold Weak Attack (X) for 5 seconds, then press Jump (A) while still holding X to perform Legolas's special ability.
Strengths and weaknesses
The archer and the mage are better at killing ents and trolls because they have ranged attacks. When you are a warrior press Y to knock over enemies (this works best on archers). When you are a troll fighting a ent (or vice versa) don't stop pressing B. If you keep doing this they can't get any attacks in.
Unlockables
Unlock the evil campaign (Rise of Sauron) by completing all the maps in the War of the Ring campaign. Completing both campaigns will unlock Legendary difficulty.
Aragorns Special Ability...