Best video game villain!

[alpha_dk]

Honestly? Medivh. (well, the evil spirit (i forget its name) that lives inside him).

"But alpha, he isn't a villain!" you might say!

Well, think about it this way --

Medivh opened the dark portal, first leading to the orc/human wars in the first place.

Medivh is directly responsible for almost everything that happened in the Warcraft 3 era... he may have been disguising it as trying to help, but his hand was apparent in *everything* that happened. Furthermore, IIRC his knowledge of demons is unparalleled... perhaps because he is working with them? Perhaps he orchestrated the entirety of the burning legion's invasion of azeroth -- it is certainly within his power and what we know of his backstory for this to be reasonable.

Now, while it is certainly possible to view the Warcraft universe in a way other than this... the fact that he had such incredible advance knowledge, and his influence led to:
1) The worldtree's destruction
2) The fall of Arthas
3) The fall of the Human kingdoms
4) The creation of the Scourge
5) The merging of Arthas with the Lich King, making an entitiy more powerful than either could hope to be separately

Well, even if he did not cause them, the events taht happened under his watch, with the level of intelligence we know he has, coupled with the fact that we *know* magic is able to control demons (see warlocks in WoW for proof)... well, it certainly is plausible that someone with the power we know Medivh has and the past history involved in his roles in the warcraft universe... I certainly would not put it past him to have engineered the whole situation.