When you are fighting the Eye of Sauron, it is important to know quite a few things. It is best to have your party consist of Berethor, Idrial, and Eaoden. Berethor should have the following skills: Double Attack and Gondor Rampage. Idrial should have this skill: Elven Rage. Eaoden should have learned these: Frenzy, Drain Health, and Rampage of Helm. It is possible to beat Sauron without these talents, but it's a whole lot easier if you have them. To actually beat the Eye, use a Morgul Decay on him. This will completely remove his armor and make it possible to beat him in about two hits from Berethor. When you get to use Eaoden, hit Sauron with either Horse Lord Skewer, Rampage of Helm, or a three-hit combo. When you use Idrial, use either Elven Rage or use her to restore health and action points. When you get to Berethor, have him do a Double Attack, then use Gondor Rampage on Sauron. The Eye should be dead by the time Berethor has hit him twice with the five-hit move. If he isn't, just keep repeating these steps over and over again.