Zuri knew about the fact that the lycan took children for their ritual in order to complete the beauty blood. Before Khaos, the ritual for the beauty blood had been recorded and Khaos had taught her of how to read it.
She was not good at it, but Khaos had told her the number of the people, who had died in the process of the completion of the beauty blood. The number was huge, but apparently, what was said in the scriptures of the lycan didn't cover the actual number.
What was written down in the scriptures, was only the children from the nobles' families, but it didn't cover the number of the children of the commoners.
Since beauty blood meant for a hundred dark curses, it meant they had to start it in the very early age, because they had to wait for the body to adjust to it and add the curses as time went by.
If they added the number of the commoners' children, the number would be staggering.