She Must Never Know

He seemed to have read her mind. 

"It's information from Dante's memories... and yours," he explained it as if it made complete sense. 

Based on the whispers Kol had heard from the statue, there were six gemstones in total. That was the number of gemstones he had found in the palm of the statue, all of which had been fed to Laina. 

Kol crossed his arms, "Well they clearly aren't as powerful as they're supposed to be."

"Foolish thinking, hybrid," Thorne said without hesitation as he looked up at Kol, "You know not what you speak of."

The damage Laina's body had suffered was not something any of them could fully understand. It was deeper than what they could see on the surface. Laina had been drawing her own blood to fill up the vials for Dante, she was exchanging her life force for Dante's cure. 

While her physical body weakens, her life force was greatly weakened.