LoganRan
Explorer
Interestingly, I believe megadungeons actually are the campaign best suited for MORE lethal systems like ODD, B/X and AD&D. There isn't (or at least shouldn't be IMO) a "story" for a megadungeon so it is perfectly acceptable for a group to roll up an entirely new party because there is no long running narrative thread which will be lost at the moment of a TPK. Plus, it can be grimly amusing (if you are wired that way, and I am) for a party of freshly rolled PC's to see the groups former characters decorating the walls of the dungeon.I'd personally favor a not-too-lethal system, just because is dull to have a TPK far from the opening and have the new party go through the already visited layers/levels.
For megadungeon, I'd go for having a party follow the tunnel of an ever-digging giant worms who swallowed your village/dear ones/whatever, so you go through various regions that the worm dug through, like a old necropolis, a dwarf-hold, a underground forest etc, hoping to catch up with the worm and take back what's yours. In the end, the worm itself could be one living dungeon.
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