Basically what this is is NPC villages that spawn underground, like strongholds or dungeons but without monsters. They could be lit by torches, and different underground houses could be accessed by a short system of tunnels. Other than the fact it's underground, it would function the same as a regular village. Maybe Villagers could offer different trade items?
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And for two and a half thousand years, the ring passed out of all knowledge... Rumor turned into myth... myth turned into legend, and legend gave rumor and myth amiss, and went straight into autumn. ...Wait, what?
I would support this for the variety and how interesting it could be but realistically it wouldn't work because humans and food sources can't live without sunlight. Also I think there is a NPC villager glitch that causes villages to require natural sunlight all the way up to the sky. (That is just what I've heard. I've never attempted an underground or under water village).
Mining Camps, underground, would be rather interesting... Little underground establishments where villagers mine precious ores and the like whilst trying to remain safe from predators...
I like the idea of entirely underground settlements. The mineshafts and strongholds already demonstrate that it is possible.
I would, hover, not suggest using the existing Villager NPCs. I've always wanted Pigmen, and I think that this would be a good use for them.
Unique trades would be good, actually. I would suggest most of the trades be things that are commonplace above ground for emeralds, and emeralds for things that are common underground.
http://www.minecraftforum.net/topic/1401777-earn-a-good-or-evil-reputation-with-the-villagers/
Click here if you support more interaction with the Villagers!
I would, hover, not suggest using the existing Villager NPCs. I've always wanted Pigmen, and I think that this would be a good use for them.
Unique trades would be good, actually. I would suggest most of the trades be things that are commonplace above ground for emeralds, and emeralds for things that are common underground.
Ignoring numbers...
logs -> emerald
wool -> emerald
flower -> emerald
...
emerald -> coal
emerald -> gold
emerald -> redstone ore
...
etc.
Note that this would include otherwise unobtainable (without silk touch) blocks like coal, redstone, lapis, and diamond ores.
I like this idea. Support!