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You definitely need to generate the map starting from a medium size with a Dungeon or a very large size without one. With this generation, there won't be relics in the adjacent zones (there will be minor and major artifacts), but relics are possible in other zones. If you generate a large map without a Dungeon, there won't be any artifacts in the Treasury – the monster strength will be extremely high, but relics will appear in the adjacent zones. If you generate a huge map without a Dungeon, then minor artifacts will appear in the zones, except for the Treasury and the Monster Tower. Basically, that's how it works.