Undeniably, unquestionably

Two week later, 

Within the dimly lit of his chamber, Eva could see the new addition into his room.

It was the jars seated in his desk.

His desk was adorned with shelves upon shelves of jars filled with crystals, a  reminder of Xylon's countless forays into the abyss. 

She could tell that these were not here before leaving him the last time .

These crystals were more than mere trinkets; they were vessels of the demons he had defeated, each one capturing the essence of the fallen entities.

 Some of the crystals pulsed with an eerie energy, signifying the lingering consciousness of the vanquished demons, while others remained inert, their dark luster concealing the secrets within.

The crystals varied not only in their level of consciousness but also in their strength and abilities.