After me changing the spots, my hunting got kinda crazy. On the very next day, I encountered another ghost, but he was not as strong as the previous one. He died really quickly thanks to my rapid growth in strength.
The two next ones I encountered were on the other hand crazy strong. Both were mages, and I couldn't do shit to them until they had mana, so I used my tactic of avoiding their crazy attacks until they had nothing more to throw at me. Then I finished the fight.
After that, there was a little bit of break with another weaker one, and on the very last day of my hunt, I finished with another very strong ghost.
I didn't use the crystals I got from the weaker creatures. Instead, I saved them in my vault, for the future. I had few ideas of what to do with those, but nothing was decided.
I almost died few times, but in the end, from the three crystals, I got a nice number of 750 927 888 745 000 regular points and 42 724 class ones.