Gasper's true identity was neither vampire nor human, but the reincarnation of a fragment of consciousness from Balor, the demon god of Celtic mythology.
In this world, Balor's abilities were essentially similar to a "Magic Eye of Time." Its time-stopping ability could be strengthened to cheat-level proportions, the darkness it controlled could cover an entire town, and it could even create unknown creatures.
And as long as the power of Gasper's previous life as the "demon god Balor" was released, that power would inevitably transform into another Sacred Gear: [Forbidden Invade Balor the Beast].
In fact, even the Sacred Gear [Forbidden Balor View] had been transformed from the power of Gasper's previous life.
The power of the "demon god Balor" was quite interesting. Even the power from a previous life could independently transform into a Sacred Gear, allowing the reincarnated body to inherit it with ease.
The reason Gasper had always been unable to control his own power was precisely because the power belonging to Balor, the demon god of his previous life, was simply too strong.
Even after it had transformed into a Sacred Gear, and even after Gasper himself had reincarnated as a devil, he still could not wield it freely.
Once the Sacred Gear "Forbidden Balor View (CrucibleBarrollView)" combined with "Forbidden Invade Balor the Beast (ForbiddenInvadeBalortheBeast)," it would become a new Supreme-class Longinus: the Sacred Gear that controlled time and space, [Aeon Balor (AionBarroll)].
And the power of this Longinus was, in truth, Balor the demon god's own power.
A genuine Transcendent.
"The Red Dragon Emperor's blood can solve Gasper's side effects?"
Rias could not say whether this news was true or false. After all, even she did not know much about Longinus...
But judging from Kiana's expression, it did not seem to be a lie.