I think they hit specialization level 6 soon, like next book soon. I don't see how not. they need 4 rooms and less than 14000 DP's. That amount of DP's on its own should allow them to build 4 rooms even without considering the remaining free room or Roswan's ability to make super cheap random rooms. the 14000 DP's seems like a lot, but between the bonuses, master node, god node, a plethora of strong monsters right outside the dungeon just waiting to be eaten, full access to the labyrinth, and an army of bugbears waiting to be lured in, I think it's possible in 1 more week. Even if he gets no extra bonus, Richter is going to have a huge advantage in the labyrinth. And he is going to be rolling in the loot. He already has more than enough resources to make his village the most wealthy population in the River Peninsula. It'll just take time and the strength to hold on to it. Plus it seems like everyone in his village will get an additional 5% (10% total) added to their affinity in one of the basic magics. He has the means to attempt to unlock every branch of basic magic in every one of his villagers. He should have an army of magi soon.