Zadkiel and Helel clashed in a show of absolute power as the angels were forced to watch from a distance. They marvelled at the amount of power shown by the two, being the strongest and further augmented by the Primordial Elemental Swords that they are wielding.
Asmodai and Yophiel were also fighting the archangels as they were able to keep them at bay using their weapons but were starting to get overwhelmed so they called for the help from the angels as well.
"You've always been so insufferable." Helel said as he locked blades with Zadkiel.
"I can say the same. What does it feel like to betray us and manipulate the girls who saw you as a reliable older brother?" Zadkiel asked him with a glare.
"*Scoff* The only sister's I manipulated are Azazil and Azariel, that Lilith is not my sister. You are a fool to think of those human's as our siblings." Helel said with a glare at his remark.
"Heh. So now you finally decide to talk your mind. Well, I'll make sure to stop your rebellion, there is nothing stopping me now." Zadkiel said as his eyes glowed.
"Bring it on. I will show you why I am the first and strongest archangel of Heaven." Helel said as his eyes glowed as well.
Their aura's manifested and clashed with eachother as both glared at the other before making some distance between themselves. Then they disappeared and then started to appear all around the battlefield clashing with eachother as the shockwaves would send back the angels at their radius.
'Tch. He also has a mystical armor as well. He has fully prepared himself huh.' Zadkiel thought to himself as he fought with him.
Zadkiel then took some distance between them and shot with his wings in full display as Helel met him. They attacked with more power and when their weapons clashed a huge shockwave was felt by Heaven as the angel's in the Sixth Heaven were sent flying from the force.
"So this is the true strength of Zadkiel. It is as much as I imagined it to be." Yophiel said as he looked at Zadkiel.
"Are you happy now? You fulfilled one reason as to why you rebelled against Father." Asmodai said to his brother.
"Yes but I still have a lot more I wish to see and learn. This is just the tip of the iceberg. Unlike you who only wants to spend time with women." Yophiel said to his brother.
"You know that I have liked women for a long time. But as an angel I can't go after other women as much as a I want. I just want freedom." Asmodai said with a grin which caused Yophiel to roll his eyes.
"That's the reason you two joined Helel." Raguel asked shocked at them.
"It might seem useless to you but that is what we want." Asmodai said as he readied himself.
"I don't care! You manipulated us! I'll defeat you even if you are our big brother!" Azazil said angrily as she readied her sword and flames started to form around her as her eyes glowed.
"Actually it was Helel who did it as we just stayed to the sidelines. You have to say though that he has great charisma to be able to turn so much of our siblings to our side." Yophiel said with a smile as he readied himself as well.
After that the two archangel's attacked them, but unbeknownst to them Asbeel was sneaking her way to the vault to get more weapons without alerting the enemy Angel's.
"Zadkiel!!" Helel shouted as he used Holy and light power along with the two Primordial Elements.
"You're gonna have to do better than that." Zadkiel said as he used Holy and Light power and attacked.
The clash of both of their attacks sent a shockwave that shook Heaven as the angels and to momentarily stop as they tried to steady themselves to fight. The two archangel's made distance between themselves as they glared at eachother thought Helel has an arrogant look on his face.
"Hah! Even with all that training you still aren't able to defeat me." Helel said haughtily as he sneered at Zadkiel.
Zadkiel just stayed silent as he looked at his blade's then at the ones in Helel's hands, his armor and the angel himself. He then closed his eyes which was seen by Helel.
"Oh? Are you afraid of me now? Realising your powerlessness after clashing with me! I am the First Angel created and the most powerful! It is time that you know your place!" Helel said arrogantly as the angels heard him before he shot towards Zadkiel with his blade's drawn.
Zadkiel didn't open his eyes and the archangels who saw it became worried as they flew towards him but were blocked by the other angels. Helel almost reached Zadkiel as he had readied his blade's to decapitate him when he slowly opened his eyes.
"No. It's you who doesn't know your place." Zadkiel said as they looked at eachothers faces.
Helel zipped right past Zadkiel and stopped with a smirk.
"If you wish to die thinking that then do so." Helel said as he looked at him.
Then various slashes appeared around Zadkiel but before they could hit him they were countered by other slashes which caused Helel to widen his eyes. But then to his shock slashes appeared around him but he wasn't able to dodge as they all fell on him.
"Aahhh!" Helel screamed in pain when he felt the slashes on his body.
"Your arrogance has clouded your mind on one thing. If you had thought clearly then you would've noticed it but it seems you are now unable to do it." Zadkiel said as he looked at him.
"W-What?" Helel said as he winced in pain and starts to use magic to heal himself.
The other angels were happy to see it and seeing that is as reassurance they fought against their enemies with ferocity. Azazil and Azariel were double teaming Yophiel as Azazil has a look of fury on her face as she delivered powerful attacks on him with Azariel following up after her.
"I was only gauging your strength when we were fighting a few minutes." Zadkiel said causing Helel's eyes to widen.
'Is he telling me that he wasn't even fighting me seriously? He was looking down on me! Me! He was underestimating me!' Helel thought to himself in disbelief before it turned into anger as he glared at Zadkiel.
His aura and power flared as he gathered them as Zadkiel also gathered his powers.
"I'll destroy you! No one shall underestimate me! I'll obliterate everything!" Helel said as he gathered every bit of power he has as he drew on the power of the swords and gathered it in front of him in a sphere.
The angels feeling the power were wide eyed when they felt it as the amount of power that he had gathered was massive. Adam and Lilith who felt it looked at the battle as Adam created a shield around the two of them as he got ready to defend her.
"Then I shall return in kind." Zadkiel said as the two Primordial Crystal swords broke apart.
They then turned to energy as he gathered a great amount of his energy in front of him in the form of a sphere as well as the angels in heaven were also able to feel the power emanating from it as they now had faces of fear.
"Everyone move away!" Michael shouted to all the angel's of God as they complied and flew away.
"We must move away from the Sixth Heaven!" Yophiel shouted to the angels in their side as they complied.
The archangels also flew away with Gabriel taking Azazil and Azariel with her even though they were reluctant. Asbeel who had came out of the armory had also felt the power and so she closed the armory and flew away with whatever weapons she had managed to get her hands on as she left the Sixth Heaven along with the other angels.
"We should get out of here." Adam said as he deactivated the shield.
He could feel the power emanating from the two spheres and he knew that if they were to clash then he won't be able to block it so he grabbed Lilith's arm and ran away with her as she looked at Zadkiel one last time before they left the Sixth Heaven.
Helel gathered all the energy in front of him as he got ready to shoot it as Zadkiel is also ready to shoot his own.
"This is your end!" Helel shouted as he attacked with the sphere sending a huge beam of energy towards Zadkiel. (Like Issei's Dragon Shot).
"No. It's yours!" Zadkiel proclaimed as he also sent a beam of energy towards his enemy.
Both attacks met eachother and an orb of white energy formed from both energy as it grew in size as it grew and grew until it almost reached both Zadkiel and Helel but the two archangel's didn't budge as they kept on attacking.
"Zadkiel!" Helel shouted releasing the rest of the energy.
"Helel!" Zadkiel shouted as he also released the rest of his energy.
What followed was an explosion which covered the entirety of the Sixth Heaven in white as Zadkiel and Helel were also enveloped by it as the flash caused tremors in all of Heaven.