Why did the Black Spirit change?

Quest Text O great one...
Fate guides me.

Summary When the meteorite and the Black Stone NPC Knowledge Item hit the land of Valencia...
The Black Spirit NPC Knowledge has existed ever since.
Leeching off a creature's brain,
it has tried to become a complete being, seeking the power of the Black Stone.
But it wasn't easy. Any creature consumed by the Black Spirit
eventually collapsed soon after, not being able to handle these dark energies.
Only one was able to survive the fight and win.
That was the great Edana.
Edana and the tribe he led, the Kabuas,
learned to control and use the power of the Black Stone.
He opened a new horizon for civilization using the symbol on the stone,
and prospered generation after generation during his two lives.
That is the story of YOUR Black Spirit.
The fact that you're here proves that you've won.

Summary Correct. The first king on the land of Valencia,
land founded by the Kabua tribe, is Edana.
The artifact you just brought
was used by Edana to control the dark energy.
It controls and enervates the hearts of ancient creatures,
including myself.
The dark energy is the origin of it all.
As it uses dark energy to control dark energy...
And yet, the weak Humans and other forces of evil
would never stop seeking that power.
Edana used the artifact to control the ancient creatures
for the sake of his descendants, and the humanity.
I'm certain you're wise and righteous.
Please. Do not take this artifact lightly.

Summary Haven't you noticed?
That Black Spirit NPC Knowledge was also with Edana.
It turned into black particles after losing to Edana,
but its ego saw you through.

Summary You'll have to find your own answer to that question.
It's the reason for your existence.
Just remember one thing:
you are Edana's descendant.

Summary Of course.
May the will of the Ancients be with you.

Summary May the will of the Ancients be with you.

Summary So this is Gyfin Rhasia's.
I sense Gyfin Rhasia's powerful energy surrounding the slab.
Now, no one can control this item.
Only you are capable.
A long time ago,
Gyfin Rhasia built a tribe with her sisters.
They made their home in a faraway place,
and prospered.
However, the enormous black catastrophe hit them,
almost wiping out the entire tribe.
Gyfin Rhasia did all she could at the crucial moment,
however they were bound to a gruesome fate.
Eventually, Gyfin Rhasia led them all on a long journey.
It was a painful journey, but they eventually found a place to settle.

Summary The Gyfin Rhasia tribe is only made up of women,
and they were stronger than any other tribe.
This strength came from Gyfin Rhasia herself.
The tribe would always sing songs.
The beautiful song always resonated in their world.
With her own unique melody,
she blessed the tribe.
However, after passing through the world of Kamasylvia,
she signed a contract with the Tooth Fairy, with one condition.
To erase their memory of their terrible past.
However, they ended up forgetting both the terrible and beautiful memories.
Gyfin Rhasia made one last song for her tribe before she died.
This slab is part of that melody.