While I was talking to Nix about worries about what's about to happen, but Nix started to vent her worries and frustrations.
With that, the other two Priests must have already managed to finish their ritual.
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Pov Hela:
I agreed to help Henrique with the ritual because I found it all very interesting, in the last two days I managed to learn a lot from Henrique about Spectral-type undead about which I know very little.
This ritual was also very interesting, it seemed to serve to amplify an Aura with dark attributes associated with death, then activate the effect of an item that Henry brought.
What was at the center of this ritual was a green skull covered in blue Runes, the moment he showed me that skull I felt the miasma in the surroundings stir and the death energy in the surroundings slowly being absorbed by this skull.
"What item is this?" (I)
"This is an item called the Sinner's Skull." (Henrique)