"Infinite" dungeon
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Just like in Lufia 2, you get back to lvl 1 with no equip and you try to make it to the end with a epic boss at the end (a huge slime that run after 4 turns does not count as epic boss
).
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I don't know how feasible that is, though, since the character must carry through to BG2 - and Heart of Fury mode was meant basically as a second playthrough at a higher level and difficulty.
I'm not sure a D&D setting is well suited to the concept of a randomized dungeon, especially when you consider compared to JRPGs, leveling is a lot slower and more meaningful.
I know it would be pretty hard to make hard to work in BG1 but I think it would be really nice. That dungeon in Lufia 2 was one of my favorite side quest in any RPG I played and did'nt see it in any other RPG