Demon Techniques!
On the Middle Continent, many cultivation techniques inadvertently changed a person's temperament during practice, leading to unpredictable emotions and tendencies towards violence and slaughter.
However, upon entering the Mountain Sea Realm, martial practitioners began to cultivate their own spiritual consciousness, significantly reducing such occurrences. Here, one could directly observe the changes in their spiritual consciousness.
Once any issues were noticed, they could be immediately addressed or corrected using other methods.
Of course, there were Mountain Sea Realm techniques that required a specific innate disposition to fully harness their power.
At this stage, some practitioners intentionally aligned themselves with the requirements of these techniques, such as severing all emotions and desires, even going so far as to personally eliminate all close relationships.