Dreamers are to be classified as weapons.
Ronan already knew he was a weapon ; but he was trying to make up for it.

And here was Ronan, like a heart attack that never stopped.

The demon kept pulling him unconscious, and in those short bursts of blackness, the dreamer snatched at light, and when he swam back to consciousness, he thrust the dream into reality. He shaped them into flapping creatures and earthbound stars and flaming crowns and golden notes that sang by themselves and mint leaves scattered across the blood-streaked pavement and scraps of paper with jagged handwriting on them: Unguibus et rostro.
But he was dying.

Where the hell is Ronan?" Gansey asked, echoing the words that thousands of humans had uttered since mankind developed speech.

Now Blue looked promptly judgmental, which was about two ticks off from her ordinary expression and one tick off from Ronan's.

To think you could have been dreaming the cure for cancer," Blue said. "Look, Sargent," Ronan retorted, "I was gonna dream you some eye cream last night since clearly modern medicine's doing jack shit for you, but I nearly had my ass handed to me by a death snake from the fourth circle of dream hell, so you're welcome."
Blue was appropriately touched. "Ah, thanks, man."
"No problem, bro.