The following contains spoilers for Chapter 75 of Boruto: Naruto Next Generations, "The Domain of Gods," by Masashi Kishimoto, Mikio Ikemoto, Mari Morimoto and Snir Aharon, now available in English from Viz Media.
In the Naruto and Boruto lore, fans have seen a plethora of Ōtsutsuki aliens unleashed upon the Earth. Thankfully Sakura, Naruto and Sasuke were able to dispel Kaguya when they were teens, while the likes of Toneri, Urashiki, Kinshiki and now Momoshiki who's trying to possess Boruto, were stopped when the heroes got older and had kids. In addition, Isshiki's plan to drain the planet of its chakra was ceased too, which is why Kawaki is now free with his modified body.
However, as Sasuke has suspected all along, there's more to these aliens than meets the eye. Come Chapter #75, Boruto drops a massive bombshell by introducing the deadliest of the entire clan. And make no mistake, this Ōtsutsuki warrior has changed the story in a huge way, hinting at a savage war to come.
Amado Reveals the Truth Behind Shibai Ōtsutsuki
When Naruto, Shikamaru and Co. press Amado on the robots he made for Isshiki, he admits he transplanted DNA from a dead Ōtsutsuki into them. This being was none other than Shibai, who scoured the galaxy for millennia, devouring planets' chakra via the God Tree and Ten Tails. He'd then use the Karma mark to be reborn repeatedly, continuing the eating pattern.
His deceased frame is where Amado and Isshiki got the mark from, hoping Kawaki could transform into Isshiki. Ironically, it's what Momoshiki used, thinking he'd rewrite Boruto. As for Shibai's power, he deployed shinjutsu, creating storms without hand seals. He could even call down lightning with just a roar, proving things like Sage Mode, ninjutsu and manipulating chakra were beneath him. Simply put, Shibai was the ultimate god who all the other aliens respected and feared.
Shibai Died on Earth - But Could Still Return
Now, Amado admits he found the warrior's remains, using this corpse to put various gifts into Isshiki's soldiers when he was hired to run Kara's experiments. The diminutive Eida has his clairvoyance down pat, Daemon got the reflective attacks, Code got the teleporting bands, while Kawaki and Isshiki got his shrinking abilities and penchant for storing weapons in a hidden dimension. Seeing as Shibai had the Rinnegan and Byakugan, even one ability would make these minions extremely powerful, as Boruto has illustrated.
The twist is, Amado isn't sure if Shibai is truly gone. After several cycles of evolution and using the Karma, he thinks there's a chance Shibai ascended to a higher dimension as a supreme god, deliberately discarding his body. After all, he wouldn't need a frail vessel like this if he evolved into the perfect form. Thus, there's a chance he could return, not even needing a shell to raze the Earth and try to reclaim what was stolen, the same way Kaguya wanted chakra back.
Except this time, Shibai will be a lot more powerful and possibly vindictive, which would require Konoha and the shinobi alliance to formulate a new plan against their greatest threat ever. Sadly, Sasuke doesn't have his Rinnegan while Naruto lost Kurama, so this would require Boruto to step up big time -- should he survive Kawaki's heel turn down the line.