Fighting big badass monsters is something a lot of people seem to enjoy. I think the story-related quests and bosses are fun but kind of disjunct from the actual world you can manipulate and effect yourself. I would love to discover bosses on planets and see a revival of "boss building" mechanics like we had in previous versions. Super rare bosses that are tied to rare dungeons or minidungeons would add a lot to the exploration. I know something like this has been started with the mother poptop for example but you could take this a step further and make bosses harder to beat while requiring more strategies. I'm not talking about just big mobs but actual bosses you can find or summon on specific places using a specific item. Think Terraria here. Aside from discovering huge bosses you have to prepare for, I liked the "boss building"/summoning mechanic in the previous versions. It lets you implement a strategy using prebuilt terrain and lets you be prepared in the best fashion. This would push the creative/building aspect of the game further and would be an idea for endgame-progression or an end-game goal. Being clever about fighting clearly overpowered bosses is one of the core mechanics and strenghts of Terraria and you could easily implement this here again as well. This has been suggested before but I would like to bring this topic up once again as we approach 1.0. I am suggesting both, progression-unrelated and super-endgame-progression-related bosses that would exist solely to please players who like a challenge and like to access end game progression after or aside from finishing the main story line. When I mean challenging I think about bosses as well that seem really overpowered. Bosses you would have to be super clever to defeat. This could be part of an end-game related update past 1.0 but I would be more than pleased to see some bosses like that implemented already in 1.0 to give some players some endgame goal to strife for. Discovering and sharing strategies is fun for many people. Beating a boss that is really hard to kill and requires lots of planning and perfect execution is something players could enjoy. They seem to enjoy it in Dark Souls and Terraria.