Two days before Jack returned to Thereath, the age of his human age increased to sixteen months. His human race's passive skill, Limitless Potential, increased to rank 10. At this rank, his HP was +2600, his stamina and MP +280, and all his attributes except for luck +10.
Jack went directly to the throne room after returning to the palace. John was not there but said he would be arriving soon. So, Jack waited for him while doing the mass pay function using the monarch system. His kingdom coffer was reduced again.
He also went to Foreign Overview and clicked the option to build an embassy in Palgrost. The action cost 100,000 gold coins. Luckily, this was also the day he received 100,000 gold coins from the Boundless Cache. So, that covered the embassy's cost.
He then used 10 RP to increase Thereath's population. The city was past 9 million population now. It should not be long before it became a megalopolis.