Energy Threads is a technique used by Kunshi.
This technique has many uses, it can be used to immobilize enemies, leaving them defenseless against attacks from teammates, it can be used to save teammates from falling off the arena and it can be used to set explosive traps, similar to a mine.
Kunshi used all three variations of this technique in the Tournament of Power. He used the threads to immobilize Hit, leaving him defenseless against Dispo, he saved Dispo twice from falling off the arena, and surrounded himself with explosive threads to prevent Hit from attacking him. The explosive threads are quite powerful, as they are capable of damaging powerful fighters like Hit, however Super Saiyan Blue Goku was unharmed by them.