Expensive safe-room upgrade Carl buys alongside the advanced bomber's studio.
When Carl said he wanted to buy the advanced Bomber's Studio immediately, Mordecai judged it would probably be fine to take the magic studio at the same time, though he warned it would be expensive. Both are among the multiple upgrades the personal space needs.
The rest of the shopping is on hold until after the recap clarifies the Guild System, but these two rooms were bought at once, funded by the roughly one million gold Carl and Princess Donut hold between them.
Costly crafting-room upgrade purchased for the party's personal space.