Ben 10: City of Sin

Those who witnessed the fight that day.. did not see any humans present.. 

They only saw two monsters running at the mechs that approached in the scorching sands. 

One massive four armed creature whose armor powered through whatever the M-Dozers threw at it.. 

And something that looked like a girl.. but acted nothing like one.. 

She ran at 300 miles per hour.. dashing on all four limbs like a wild dog, laughing wildly.. foam gushing from her fanged mouth as lightning streaked from her eyes.. 

It was not a battle. 

It was an execution of punishment on sinners. 

How fitting that it was the City of Sin.  What other place was more fitting? 

Olivia needed no sword, using the bone sticking out of her unhealed arm as a weapon as she stabbed and tore it through the body of the first mech she met, ripping it apart in an instant before ripping the screaming pilot out of the cockpit with her healed hand. 

The man pleaded for mere moments before his skull and spine were torn clean from his bloodied body, and then flung aside as Olivia leaped at the next mech, bullets cleaving holes in her body, but not slowing her down in the slightest. 

Four Arms tackled and bashed multiple mechs, crushing them with his four powerful limbs, now practiced in how to beat them thanks to his initial fight with Fistrick. He targeted their waists, ripping them apart at the point where the mechs connected with their bottom halves, bullets and high impact armor piercing rounds carving cuts and scars into his muscled body. 

The two of them thought of nothing except killing everything in sight. 

They were a sight to behold, a perfect murder machine  working in unison, like a bloody melody sung from a couple performing a duet they had practiced since childhood. 

Even with Olivia's now wild and feral nature thanks to the Absolute Murder Mode's function in making Weapon 10 into a "Thing that kills until there is nothing left to kill" 

It was a mode that Olivia had known since her enhancements had finished. An experimental mode exclusive only to a few Weapon Sisters. A last resort designed to allow that sister to take their opponent down with them at least if all was lost.   

But it was a dormant function, one that would never work, for Desmond could never find the technology to make it work. The things needed to make it work was beyond anything human science at the current level was capable of-

Alien Science however.. like the Omnitrix.. 

That was a different matter. 

The Omnitrix was not capable of banishing the Calamity. The Calamity was not genetic, nor was the Calamity even of the same universe as the Omnitrix. 

So the creator of the Omnitrix, in his desperation to save the one thing his invention's wielder could not bare to lose.. did the only thing he could possibly  think to do. 

Rather then banishing the Calamity, he completed the function that Desmond could not- and with the Omnitrix's Power Source of Existence itself..  he assimilated the Calamity.

So in fact the Completed Absolute Murder Mode was in fact comprised of 3 ingrediants.   

1. Sion Industries Tayden Tech Nanites.

2. Galvan Omni Tech from the Omnitrix.