World Crystal Stones can be used to condense one's Inner World, and are considered even better than Pure Yang Holy Water for this purpose.
Usually, when someone falls, their Inner World shatters, gradually leading to destruction, and the World Crystal Walls will collapse, causing the World Force within them to dissipate.
Therefore, it is generally difficult to come across World Crystal Stones, unless preserved under specific conditions.
The World Crystal Stones typically sold in the dark market are obtained from slaughtering; hunters kill cultivators who have condensed their Inner Worlds and then forcefully extract the World Force-containing crystal walls.
This is an extremely cruel act, no different from demons refining humans into Medicine Pills.
Once discovered, it will trigger relentless pursuit and killing.
Such actions are absolutely forbidden by the major powers, as condoning them would lead to chaos in the order.
