You can increase the damage after filling it up, that's all, but you need to accumulate strength to exert your maximum attack power. PK field has no time to accumulate power, and is generally used for sweeping the floor quickly from a long distance, launching surprise attacks, pressing corners, pressing up, and using invincible effects to hide some skills such as missiles, fires and infernal affairs when rushing out.

Heightening is meaningless, the floating height does not increase, and protection is more likely to appear when the attack is high.