Gain High Elven Technology

Have you ever wondered why the High Elves are in the game, yet you never are allowed to use them? Well, in one Undead mission, you may. In Chapter 5 the "Fall of Silvermoon" where you are finally able to kill Sylvanas and end up turning her into a banshee, you may make a bansee from your temple of the damned and possess a villager; afterwards, you're allowed to build kick ass towers that can be built anywhere on anything, including cliffs, bridges, walls, trees, and even on water, though it has to be right near the shore. in addition, they're not that expensive and are some of the best defensive structures in the game, and the dragon hawk unit isn't too bad either. (I would recommend activating the immortality cheat to get the villager, though it is unnecessary)