The more Shadow Zibonzi merges, the more powerful he becomes. At that point, he merges at 50%.

That form is a state that he has yet difficulty to access, because of the high merging level. Shadow Zibonzi covers his whole body in an armor of nearly indestructible Sculk. Maintaining this state costs a lot of energy to Shadow Zibonzi, who currently cannot hold it for more than 15 minutes. While in the armor, he can access to new abilities such as summoning Sculk swords that float around him and that he control using telekinesis. While in the armor, his speed is decreased but he's got even higher strenght.

This form takes a good 40 seconds to activate and complete, and if destroyed, it can't be regenerated for several minutes. Aware of that, Shadow Zibonzi is training to get to merge better and faster, and increase his stamina so he'll be able to hold the enforcer mode longer.