Although magisters usually had the habit of reciting a lengthy invocation when summoning a [God], that would only slow down the summoning in actual combat.
Dark wasted no time and directly used a Tribute Summon.
As the Tribute Summon succeeded, an enormous pitch-black tribute summoning circle abruptly appeared in the sky.
Black clouds immediately gathered and lightning flashed. Something like a fiend seemed poised to crawl out from the summoning circle, radiating an exceedingly sinister, dark aura.
Along with it came an incomparably dense [Underworld Aura]!
Clearly, summoning [Osiris's Black Spirit Vulture] required communicating with the [Underworld].
It was much like how Dark leaked an [Abyss] aura whenever he used a Fusion Summon to summon [Demon God: Abyss Walker].
And once one communicated with the [Underworld], it was equivalent to ringing a bell to alert its ruler.
Though such an alert was, at most, mere "noise" to a god like Osiris, someone might be watching for it specifically.
Now that [Underworld Duel] had only recently begun to be implemented, Osiris was surely paying attention to its development.
Thus, Dark had already prepared himself mentally for Osiris's gaze when he summoned [Osiris's Black Spirit Vulture].
—It was not as if he had never been watched by a god before. The gaze of Apollo, the [God of Light], might well have been upon him too.
At this point, one more made no difference.
To show due respect for the [God Card], Dark took out [Greed V].
[Osiris's Black Spirit Vulture] was actually a [God Card] more suited to [Gluttony], but he did not have [Gluttony V], so he could only settle for the next best thing.
As black lightning crashed down, the true body of [Osiris's Black Spirit Vulture] finally emerged from the tribute summoning circle.
It was a black-feathered vulture with