This Evil Mode is probably the hardest in the game. When you get to use the Witch-King, make sure you take out Gandalf first. If you don't, he can use Bolt of the Valar on you, which takes off about 24,000 HP every time. Then take out Berethor, who can smash you with Gondor Rampage. The other two warriors in the party are generally not as dangerous, so concentrate on them last.

NOTE: Elegost can really damage you with True Shot, so you might want to take him out too. Morwen can also slice off chunks of your health with Rohirric Rampage.