Normally I'd just roll with these things, but I crawled tooth and nail over four hours and losing five inventories going through the absolute mess that is the Thaumcraft Outer Lands, only to find that the tablet room had no tablet in it at all. Just a bunch of guardians and an empty endcap (which exploded when I bashed it in a fit of rage). There's a boss room in the dungeon, so there should have been a tablet in that room; can anything be done about this?
Absolutely sure. It's the one with the different brick textures, holes in the walls going out to the death barrier bit, and the single endcap pillar in the center.
Nah, nothing else had been touched in the entire dungeon (and I mean the ENTIRE dungeon; I'd literally been everywhere else before finding the tablet room) and there's not any other portals in a 500-block range, so it'd be generated when I went in anyway.