Stein fell to his knees, tired to the bone. That blow should have killed the meddlesome witch, Her soul had been ripped to pieces, and yet some mysterious outside force had held it together. While Stein would love to have sliced into her to discover jus HOW she had done that, the Godkiller Resonance had taken a lot out of him, and he would need to rest before he'd be any use in battle. However, he had a better idea. "Help! The witch turned invisible and hit me!" Wounds appeared all over Stein, self-inflicted through Stigma, lightning flickering around him slightly to make it appear as if HE had been the one struck down.
Stein tapped into Ruby's mind, using the last of his resources to make her say something, just a single sentence. "Mistress Kaika, I will deal with them!" Stein smiled, as he started to slump into unconsciousness. No doubt some of them would want to kill him, but Mia would protect him from harm, and he had seeded enough confusion to have them fighting among themselves for ages, depending on how strong the bond between them was. Stein's world slowly faded to black.
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Mia was worried as she sensed her father use Godkiller resonance and his opponent not die. That was his ultimate weapon, developed to kill Gods. After using that, he'd be completely vulnerable, and Mia wouldn't have any of that. Especially not with so many people around. She would have run out there herself and killed those that threatened her father, but she knew that she couldn't do that. When her father woke up he would be angry at her for ruining his plan, she just knew it!
Deciding, Mia shot out a single snake, high into the air, aiming it at the witch's soul. It shot down from the sky, accelerating as it flew, a black snake with glowing green eyes, the size of a man's arm, at least three meters long. It launched itself to latch onto the witch, trying to deal some damage. While Mia doubted it would kill her or even deal any significant harm, she needed to distract her from dad. 
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Lilith held up her blade, which by now had fully filled up with the power of this battle. She grinned at her opponent, the fool who thought himself immortal, even before the power of a Mother of Demons. She swung her blade, and a wave of red light followed it, rushing forward and consuming all in it's path. It shattered Megatron's overt shield like it were nothing, continuing on it's destructive path as it broke through the battle. It kept moving as it hit the Ark, ignoring the defenses, a massive wall of red light that cut the entire battlefield in half, killing dozens on each side, reducing them to piles of burnt junk.
As the light began to fade, Lilith stood, panting and laughing, before the smoldering wreck of what had once been a great villain. She had used much of her power, but it had been fueled by battle, and there was so much of that here. Destruction fueled destruction, hate fueled hate, and the cycle reached it's peak in her Exodus. Both sides had been decimated, and she strode towards them, laughing. Even without much of her power, she would annihalate all those before her. She wouldn't have to use such a powerful attack again to defeat these fools.
((If you want, Megatron's Spark survived to be recovered later, but he's out of the fight for now, at least.))