Since the strange little girl lured Caizher to this area and the heavens tried to kill him again. This ghost is surely not some normal ghosts especially since the black crystal that he was in has extremely high-quality dark energies
The drop of black liquid should also definitely not something 'normal' but the strange thing is that Caizher cannot sense any aura from it. It was like the black liquid is perfectly normal water and the only difference was that it was black in color
Even then, Caizher won't easily believe that this drop of liquid is not special. After all, even the little girl that had him enter this place also doesn't have any kind of powerful aura
In Caizher's experience, the more a thing looks and feels normal, the more mysterious and extraordinary it would be. Caizher reach out for that liquid before it entered his spirit sea on its own along with the remaining body of the ghost