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Yes, this is one of the new doungeons recently added by Azanor. The blocks they're made of will be very usefull if you plan to manipulate the aura nodes (at least according to the last DW20 Thaumcraft 3 Spotlight)
Yeah, they are new in the latest version of TC3. I've mined a bunch of them for their unique blocks. There is a zombie Pigman spawner a couple blocks under the chest.