Marvel-s - Agents Of S.h.i.e.l.d. - Season 5

The final battle was a storm of grief and desperation. Coulson, his fatal wound now spreading across his chest like black lightning, knew his part. He had the serum that could give Daisy the edge—but it was the last of the Centipede formula. His only cure. He looked at Daisy, at the terrified young woman he’d raised into a leader, and he made his choice.

But Phil Coulson was dying on the floor of the Zephyr , the black scar reaching his heart. He had traded the last days of his life to break the loop. To give them a future. Marvel-s Agents of S.H.I.E.L.D. - Season 5

“Everyone stay calm,” Coulson said, his voice the only familiar anchor in a sea of strangeness. But the man who shuffled to the bars of their cell wasn’t listening. He was human, but hollowed out, his eyes wide with a terror that bordered on worship. The final battle was a storm of grief and desperation

He faked giving her the serum. Instead, he injected himself. His only cure

The season fractured the team in ways Loki’s scepter never could.

They arrived in a warehouse, rain lashing against the corrugated steel roof. And there, levitating above a Gravitonium containment rig, was their old, forgotten foe: Glenn Talbot. Driven mad by Gravitonium’s whispers and his own broken ego, he had become the super-powered "Graviton." He wasn’t going to break the Earth. He was going to absorb it, pulling every last chunk of the planet into his own gravitational field to make himself a god.