Top 10 Magnificent Final Raid Bosses

What are the best final bosses of raids? Is it just mechanical difficulty, coolness factor, nostalgia, whatever might make you think back and say "you know, that was a pretty neat final boss"

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10-Kael'thas
9 -Blackhand
8 -Gul'dan
7 -Onyxia
6 -Ragnaros
5 -C'thun
4 -Illidan
3 -Garrosh
2 -Yogg-Saron
1 -Lich King