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I just thought I would start this topic, as the title said, asking what the most epic boss you fought in an mmorpg was, and more importantly, why.
I've been a hardcore WoW player for about 2 years now, and I've seen all of the content, and while I don't have any other mmorpg to compare it to, I think the game has some pretty immense encounters. The four that defined the game for me:
C'thun: Possibly the strangest boss I have ever come across in any game, let alone in an mmorpg. A giant eyeball that fires constant beams of death everywhere (you can easily get one shotted in this fight), spawns tentacles all around the room you fight him in, and, weirdest of all, you have to get swallowed by him and attack the inside of his stomach in the second phase to take him down. But what was most epic about this encounter was the voices, the whispering: "Your friends will abandon you", C'thun whispers on a number of occassions. This made the encounter epically creepy and all the better for it.
Kael'Thas Sunstrider: I often hear this is WoW player's favourite encoutner, and quite rightly so, it's epic beyond all proportions. A fight designed to make you panic, his assistants slowly release one by one, and you take them down; he then reanimates some weapons which you also have to take down, and then all of his advisors get resurrected at once: before Kael himself descents upon the unexpecting raid group. Thus follows the most panicked I have ever been while playing an mmorpg: phoenix's spawning which slowly die but their eggs must be dpsed, shock barrier which must be destroyed before Kael one-shots the tank, and finally, the most interesting gimmick I have ever seen in a boss fight: Gravity Lapse, the whole raid is teleported to Kael and flung into the air where gravity ceases to exist. You get to swim around in the air while trying to avoid the chain lightning, waiting for it to end so you can go and pound the boss. A truly epic fight that was sadly overlooked (once the attunements for harder content was removed) by much of the community.
Kalecgos: Another gimmicky fight that I remember wiping for weeks on, but I can honestly say that for the weeks I wiped I did not once get bored of the fight. Basically two fights at once: A dragon in one realm, a demon in the other. You have to kill both within a few seconds of each other, or the fight will fail. How this is achieved is through portals which spawn randomly throughout the fight, and players must take the right portal at the right time with their group, to ensure that both bosses go down equally, there are enough healers in each realm, there is a tank for each realm, etc. What made this fight for me was the pure teamwork that went into it: It was the first time in my WoW career that everyone spoke on vent, when they had gone through the portal, and the fight as a whole was beautifully designed.
Kil'Jaeden: The final boss of the TBC period (as you might be able to tell, this is where I spent most of my time raiding) was the epic fight that it had always promised to be, much more so than an epic-but-ever-so-disappointing Illadin fight. While most guilds didnt get to see this pre-nerf (mine included) due to the cock-block that was M'uru, the fight after it had been nerfed still seemed as epic as it had always been. A fight of many phases, with many things to dodge (meteors, fireblooms), Kil'Jaeden would also spawn mirror images of a random party member which had to be taken down swiftly, and would regularly cast his ultimate move "Darkness of a thousand souls", which would instantly kill anyone in the raid. How was this countered ? Due to the allies you had made along the course of the game, the blue dragonflight are here to help you and provide you with - you guessed it - dragons. Chosen members of the raid would control a dragon which would help provide buffs and would shield party members during darkness, and added a new dynamic to the fight. Getting him down was much harder than it seemed, and like Kael'Thas, it was a fight primarly designed to make you panic. Getting him down was amazing and it was a fitting end to The Burning Crusade.
So, now that I've shared my experiences I would love to hear yours from mmorpgs - whether they be epic 40 man raid bosses, ones you've killed in a small group or even something you have soloed, are there any fights out there that have made you gasp in awe and yet thoroughly enjoy at the same time ?