Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... 

Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.
At the same time, I am able to absorb 
other people's powers as my own.
في نفس الوقت، أستطيع امتصاص قوى 
الآخرين كما لو أنّها قوايّ
und ebenso die Energie
von anderen in mich aufnehmen.
Del mismo modo,
puedo absorber su energía.
Del mismo modo,
puedo absorber su energía.
et d’enfermer leur énergie
à l’intérieur de moi.
E allo stesso tempo sono in grado 
di assorbire i poteri altrui e farli miei.
Ao mesmo tempo, eu sou capaz de absorver os 
poderes de outras pessoas, como se fossem meus.
а также забирать
себе энергию других.