Truely great and memorable bossfights are few and far between...
Today I've finally beaten Daimon's 2nd Form (he's the final boss in Dark Arisen's Bitterblack Island dungeon - Diablo if you will). Must have taken me somewhere between 1-2 hours of highly concentrated gameplay to get it done with my lvl 120 Mystic Knight.
Fellow has numerous attack patterns from melee to grapple to crowd control to ranged dps, he's casting the highest magnitude of magicks in split seconds, stacking spells like High Bolide and High Seism. He has an easy way of dispatching all my pawns in one swoop, if I don't manage to stagger him out of it.
Watch a lvl 130 something Fighter take him out in roughly 3 hours here. There's supercheap ways for Strider-archetypes to take him down, but all-in-all, if you don't cheese Daimon, it's one of the best flippin' bossfights I've ever had the joy to overcome. The toughest cookies are often the sweetest, if it's a fair fight. Daimon is, and it's a masterpiece.
What's your favorite bossfight in recent memory and why? And please put a spoiler warning at the beginning of your post, to warn what game it concerns.