Upping Stones by Tayla

You can make +4 spirit stones at Seon-Pyeong to +5 Spirit Stones.

The first step is to produce 30 x Geistein-Extrakt. Put the Stones you want to extract into the inventory and address Seon-Pyeong. Then you have the choice to either convert individual Stones to Geistein-Extrakt or to exchange all Stones in the inventory at once.

1 x 0 Stone = 1 Geistein-Extrakt
1 x 1 Stone = 2 Geistein-Extrakt
1 x 2 Stone = 3 Geistein-Extrakt
1 x 3 Stone = 4 Geistein-Extrakt
1 x 4 stone = 5 Geistein-Extrakt
1 x 5 stone = 6 Geistein-Extrakt

To make +5 stones you also need 15x Steinstück, which you get from Muschel and 1.000.000 Yang.

Then proceed as follows: Take the desired +4 stone and place it on Seon-Pyeong.
In the opened window click on improve.

Upp the Spirit Stones can fail.