Kronos - Regeneration Through Manipulation

“Angry?” Luke roared. “Give up on me? He abandoned me, Percy! I want Olympus destroyed! Every throne crushed to rubble! You tell Hermes it’s going to happen, too. Each time a half-blood joins us, the Olympians grow weaker and we grow stronger. He grows stronger.” Luke pointed to the gold sarcophagus.
The box creeped me out, but I was determined not to show it. “So?” I demanded. “What’s so special ...”
Then it hit me, what might be inside the sarcophagus. The temperature in the room seemed to drop twenty degrees. “Whoa, you don’t mean—”
“He is re-forming,” Luke said. “Little by little, we’re calling his life force out of the pit. With every recruit who pledges our cause, another small piece appears—”
“That’s disgusting!” Annabeth said.

***

Sea of Monsters, Chapter 9