Kakashi couldn't destroy the Gedo Statue's head because of its durability. It could be the same issue occurring here.
As for why he didn't use the offensive power of his left eye, its long-range attacks were strong, but they typically only severed limbs. Against a massive, highly resilient Special-Class Danger Beast, it would be difficult to land a one-hit kill.
Akame ga Kill: Starting with Dual Kamui
Anime & Comics · PinkSnake
Madara's true power was never explicitly shown or explained. What was seen during the time-reversal sequence was more of a representation of how overwhelming his visual prowess was.
Each Mangekyō Sharingan had a unique ability, and among them, the strongest was undoubtedly the space-time technique Kamui.
Mash-up Anime World: Creating the SCP Foundation to Contain Anomalies
Anime & Comics · VenerableZay
Minato made it by copying the tailed beast bomb.
Also, Rasengan is no longer exclusive to Namikaze Minato.
Naruto: I'm Nine-Tails and My Host is Kushina
Anime & Comics · Uzumaki_Kushina_21
The Nine-Tails can manipulate the host’s chakra as long as the seal is weakened enough, which it is in this case. This has been shown multiple times. A good example is when the chakra arms moved on their own or when it was able to form a Tailed Beast Bomb. Additionally, it could possess and manipulate the host like a puppet—such as during the Fourth Great Ninja War arc—where it occasionally spoke and attacked through the host.
The entire training ground was filled with hundreds of Kushinas.
Naruto: I'm Nine-Tails and My Host is Kushina
Anime & Comics · Uzumaki_Kushina_21
"Thank you, I'll take over from here." The Commander then turns to face the other Fleet masters. "Within 5 years, these goals need to be accomplished. First, we will map out as much of the New World as we can, leave no stone unturned. Then, we will clear a specified area of any obstacles to commence are operation: to subdue the Elder dragon recently termed as Zorah Magdaros."
Roar of the Anjanath
Video Games · Gearjay
The Tobi-Kadachi is a strange combination between serpent and squirl, with spikey fur traveling from it's back to its tail and a snake like head. "Later squirrely, next time stick with hunting acorns in your next life." Evans having said all the mocking things he wanted to, began to intake large amounts of air. The fanged wyvern, sensing imminent death, attempts to run, but stumbles from how mangled its leg is.
Roar of the Anjanath
Video Games · Gearjay
"The Phantom Troupe's first-ever full gathering!"
In HxH with Doraemon Pocket
Anime & Comics · NenMaster
Is he not older than 100?
"It's called [Age Spring Water], right? Something related to age? I'm almost a hundred years old, so consider it a birthday gift from our junior... By the way, how do you use this? Just drink it?"
In HxH with Doraemon Pocket
Anime & Comics · NenMaster
Obana pointed toward the rooftop where Yamamoto stood, his figure resolute under the sunlight.
Marrying Unohana Retsu from Bleach
Anime & Comics · Reborn_noob
Marvel Universe – Earth-2149
The Shadow Monarch In The Marvel World
Anime & Comics · itachi1010