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Okay, let's start with the fact that Vesek was from Paradise, as indicated by the feathers. What was he doing at the Witch's door? Most likely, he was trying to kill her, but he was killed first. Now, let's look at the clues...
and also lava from several volcanoes that erupted under the Witch's door, in a bush called wormwood, a precious artifact of power was hidden among the dry branches, covered with a scattering of daemonic crystals
I think that somewhere in these words, in these clues...
daemonic... not from the word Diamond? Maybe we should look for stones.
Now, about the Lizard.
This one was most likely a city dweller; the mausoleum hints at it.
Inside, it smelled of sulfur: there was no one inside, a tome made of ethereal steel lay by the fireplace, with a dent from a blunt object, which is noteworthy: the pages were scratched with a blade whose shape resembled an arc…
Sulfur is unlikely to be a clue, but the arc... maybe it's a rainbow?
The Oracle entered the room, saying: "One must know that there are two ways to fight an enemy: first, with laws, and second, with force. The first method is characteristic of humans, the second of beasts; but since the first is often insufficient, one must resort to the second. Hence, 'He' must learn what is contained in the nature of both humans and beasts..."
Here, perhaps, is an additional clue, or just text...
P.S. I'm going to browse the profiles while my brain works)
Added 10 minutes ago
about the volcanoes, hmm... I didn't find anything related to them, only an association with the address Vega appeared. There are many volcanoes in Kamchatka.
But in general, they confused me... maybe it's something like a trail? Then it could indicate demons (they leave fiery trails), or it could be a reference to the abilities of Tieru and the Witch.
As for the rainbow, it exists with TaCo and Pandora
Added 2 minutes ago
although I'm probably just rambling[br][/br]
Continuing on, the doomed ones reached the mausoleum of WhiteLizard, the doors were open, it smelled of sulfur inside: there was no one inside, a tome made of ethereal steel lay by the fireplace, with a dent from a blunt object, which is noteworthy: the pages were scratched with a blade whose shape resembled an arc…
here maybe an indication of a role
The Oracle entered the room, saying: "One must know that there are two ways to fight an enemy: first, with laws, and second, with force. The first method is characteristic of humans, the second of beasts; but since the first is often insufficient, one must resort to the second. Hence, 'He' must learn what is contained in the nature of both humans and beasts..."
and here is already a clue?
yes, I need to check