With Chapter 13 complete you can now go back and gather a bunch of Gaius Dumplings that are newly available in the world, see the following list:

• Trigleph - Rodo Apartments - 2F - Balan’s Room
• Trigleph - Trigleph Port - Inn - Lobby
• Duval - Marketplace
• Duval - Duval Station
• Marksburg - Elym Harbor - Inn - Lobby
• Marksburg - Reize Harbor
• Marksburg - Reize Harbor - Inn - Lobby
• Hamil - Mayor’s House - 2F - Room 2
• Aladhi Seahaven - Inn - Lobby
• Spirius Corporation - 40F - CEO’s Office
• Sapstrath Seahaven - Inn - Lobby
• Lakutam Seahaven - Inn - Lobby
• Xian Du - Inn - Lobby
• Kanbalar - Inn - Greatpeak Room
• Kanbalar - Residential Ward - Residence
• Drellin - Auberge Trotha - Room 202
• Orda Palace - 3F - Archives 1

Other treasures that are not Gaius Dumplings:

Spirius Corportaion - 20F

• Saffron - Same location as the previous treasure, at the top of the left planter

• Kitty Toy - On the bookshelf in the southeast corner of the office
  Spirius Corportaion - 30F

• Basil - In the top center of the northern planter
  Spirius Corportaion - 40F

• Chamomile - In the top right of the closest planter to the elevator
  Spirius Corportaion - B10

• Orange Gel x2 - In the left planter, on the inside

While getting the dumplings you should get the skit The Land of Canaan Appears in Marksburg.