In a poignant scene, Sir Nighteye passes away, surrounded by All Might, Mirio, and Midoriya. Before dying, he uses his Quirk one last time on Mirio, assuring him that he will become a great hero despite losing his Quirk.
You can watch the full episode on major streaming platforms: Boku no Hero Academia 4th Season Episode 14
Following the intense battle with Overhaul, the heroes deal with the physical and emotional fallout. Nighteye is rushed to the hospital in critical condition after using the last of his strength to look into Midoriya's future—seeing a "bright" one that defies his earlier grim prediction. In a poignant scene, Sir Nighteye passes away,