Depends if you mean wow or wc3. Main boss of wow right now is Deathwing, and there are no main bosses of wc3, only bosses of each campaign, there's no overall boss to kill/goal to complete.
Father of Onyxia, leader of the Black Dragonflight. Main boss of upcoming Cataclysm release.
The World of Warcraft boss Onyxia has a total of 8 abilities. The main ones that it most commonly uses are as follows: Breath (releases fire breath with an unlimited range), Fire Ball (which also has infinite range) and Heated Ground (which is ranged, damaging enemies that are close to it).
No, Chuck Norris is no a raid boss in World of Warcraft. However, some people think he should be.
Illidan Stormrage is a fictional character mainly seen throughout Warcraft III: Reign of Chaos. He later became the main boss in the second expansion of the World of Warcraft series.
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He is the boss in the dungeon Deadmines.
The elevator boss in wow is not a Boss but a joke referring to the amount of people who die clumsily falling off raid or dungeon elevators.
Vanilla means from the original game, so the game without expansions or mods. Vanilla World of warcraft means everything that does not include the expansions. A vanilla World of Warcraft boss would be onyxia
My main in World of Warcraft.
2nd to last boss of Naxxramas. It's a big frost dragon.
Malygos is the boss of the Eye of Eternity, the Onyxia-style raid instance in the Nexus.
Garrosh Hellscream, the last boss in 5.4 Siege of Orgrimmar. level unknown but obviously level 90 or higher.