Void Tactics Cultivation Technique

Cultivating this technique, the user gains the ability to enter the world of shadows the stronger your soul realm is, the longer you can stay in the shadow world, Cultivating Void Tactics also allows the user to integrate with up to 4 demon spirit beast at once Lachlan paused then thought there is that word again integrate what does that mean? I'll have to figure it out later The drawbacks of the technique is the physical body becomes extremely weak after leaving the shadow world the longer you stay in the shadow world, the longer your physical body is weakened