well I have done alot of research I mean alot. I have read over at least 2,000+ articles on yuber and has rune,yes some stuff I theorized about yubers past, but now as far as the Hachifusa Rune through my own compliations I think I have came up with a good idea how the rune works.
Origin-Zablahn Mountains,Harmony Village,Black Empire Region(Now nameless lands)
Year Born: IS/-642
Rune:Hachifusa Rune(1 of 27 true runes)
Yuber was born in the Harmony Village in mountains of Zablahn located in the Black Lands(Now Namelesslands).
yuber growing up as a child in Harmony village lead a peaceful life in the mountains of Zablahn.Until small group of black knights
were exiled from the Black Fort Empire for trying to steal the Asfusa(Ninefold) rune.The knights that were exiled.Angry
with The black empire they started a civil war against the empire. So Harmony Village was attacked first,favoried allies of
the black fort empire. The exiled knights attacked the village burning it down claiming they won in King Pesmerga's name.
Knowing their attack would work, cosnidering Harmony village was passive. Yuber watched his village,his parents,everything he
knew die for no reason. Yuber flee'd the village and lived in solitude in Zablahn mountains for 2 years,in solitude,training
plotting his revenge against Pesmerga.Pesmerga's army found burnt villages,everywhere.Which just lead them to beleive the
civil war enraptured Harmony village.Yuber thinks the empire betrayed him.Pesmerga knows nothing of yuber at this point.
Fianlly got his plan for vegenace.Yuber acts his plan out.Joining the Black knights only to fulfill his vegeance(plan is to steal
psemerga's rune)Yuber becomes a soldier in the black knights as a renowned magic tactian.Once trusted finds the Asfusa rune
and attempts to steal it.Pesmerga watchs the events from afar and hidden from Yuber.Pesmerga watches as
The rune strikes Yuber.asfura rune quickly returns to pesmerga,rendering him unconscious.The Asfusa rune gave Yuber a curse.
The rune Hachifusa(Eightfold) and it is Yubers curse for his attempt to steal the True Rune.
Yubers hand began glowing and Yubers rune explodes with energy.It this process the year happened to be-666.
Yuber vanishes for long time as does Pesmerga.Both re-appearing eventually.(leaving you to beleive they were only 2 surviors
from Yubers' rune explosion).Yuber's quest is now to destroy all runes for giving him his curse.
(the rune also transformed him to half rune/half human,thats why his power in un-like any humans)
Hachifusa Rune-rune of Eternal Chaos.Its power is soley based on chaos and decpetion.Its sole creation was to curse its bearer.Yuber's curse is to live in the world of emptiness.
That is why Yuber acts in such said pattern. But in return for the runes curse, meeting the
demands for the rune, The rune grants its bearer its powers. Its potential,however, for what powers it holds,its possibly limitless consdiering yubers long exsistence,therefore given time for Yuber to master its ablities and powers.