Guild Wars 2

Iron Forgeman from SE story. Gaheron Baelfire from CoF story would be my second choice… I like bosses with unique mechanics, that you need to figure out, instead of dodging everytime you see somekind of animation or something and after that is just hack and slash. New AC is a step in the right direction, would love to see other explorables revamped.

There is an interview by Dragon Season, in which Colin mentions “Hard mode” instances, harder than explorable. Imagine the nerf threads after that

Source:
http://dragonseason.com/Front/tabid/124/EntryId/211/Lunch-with-Colin-Johanson-Part-II.aspx