This data-pack adds a randomly generated dungeon, that ranges in size from very small to absolutely massive. With many staircases, corridors, secret rooms, and multiple levels expanding out 100's of blocks.
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one of the randomly generated corridors
This is an older photo - rooms are updated a bit but the dungeon itself is unchanged from the pic. And L turns, those are in the current version too.
Dungeon main hall
a library with some loot chests
Room with loot chests and some ores, upper level
one of numerous hidden rooms in the dungeon
Corridor of the lower level - better loot, stronger enemies