[Skullcatrons]

I'm not entirely sure what they could reveal that might make much of an impact for the folks on the island, but I can't pretend to be an expert on the lore.

Very well then.



What Korvarans do not know;

The Gods themselves, including Zera, Huggessoa, Mercala, Ryart. They are real.
That the races are manifestation of the Gods' will themselves upon human template, evolving basically.
That there is a whole God-war thing that happened, named the Heavenly Contention.
There is an actual way of doing teleportation system reliably (Korvara do not have real Mage's Guild)
The existences of the world at large (korvara is isolated)
The Black Doors Phemenons (Korvara so far do not have BDP)
That Gods empower magic (Mercala especially moreso, which is why healing is weakened in Korvara)
Vampires, Liches, Sentient Dullahan (Ones Korvara have is not sentient).
This extends to Mechanations, and Zera. 
Black Beasts and Seto (They do not act in Korvara either)
The Asago Corporation
And so much more...

What Korvara do knows is Magic language are same as rest of Sigrogana, that the races are named what they are (Despite gods being absent and it's why some people made up names for them instead of using original), and finally, Elves know of Mersales. But only Mersales.