When two worlds collide.

The Final Battle.

A/N: I updated the last bit of the last chapter so check it out if you haven't already!

Alex walks up the stairs to where she battled Voldemort last.

"VOLDEMORT!" Alex yells.

Nothing is in front of her, only a void behind the blasted battlement. Only the sky and a great fall.

She heard a woosh behind her and the hairs on the back of her neck stood up as shivers went down her spine. She turns back and there stands Voldemort.

"You were right." She folds her arms. Voldemort's eyes glitter curiously. Alex's eyes drift to the wand in Voldemort's hand. "When you told Professor Snape it was failing you. It will always fail you."

"It belongs to me! I killed Snape!" Voldemort growls.

"But what if the wand never belonged to him? What if the wand's allegiance was to someone else?!" Alex grins tauntingly.

Voldemort stares at her. Confused. And suddenly, in this moment, it is Alex, beaten and bloody, who seems in control. She smiles, then presses even closer, her voice quiet, vaguely taunting: "Come on, Tom. Let's end this the way we started it.." Alex grabs Voldemort's cloak in both hands. "Together!" And then she falls back, pulling them both into the void.

. . .

The avengers dash down the stairs. Nagini closes on them. And then, suddenly, Nagini hisses madly, twisting crazily on the steps, tail snapping back and forth, shattering stairs and walls.

"What's the matter with her?" Loki scoffs.

"I usually adore snakes, but this one, hell no." Thor mutters.

"It's Alex. She's weakening Voldemort, and it's weakening the snake." Strange smiles proudly.

They watch Nagini thrash. As rubble rains down, they begin to run for the Great Hall, skirting Flitwick and Hagrid, who battle a pair of Death Eaters on the stairs. Further up the marble stairs, professor Trelawney raises her wand, draws a bead on a Death Eater and with a forceful flick, sends him flying through the air.

. . .

Alex and Voldemort plummet, twisting crazily, when suddenly a crack fills the sky and they apparate into a plume, entwined, morphing monstrously in and out of one another, a single screaming beast one minute, adversaries the next, hurtling downward, toward the courtyard below.

The fighting wizards stop, peer upward at the plume above. As it streaks towards the ground, another crack fills the sky and Alex and Voldemort burst apart as they meet the ground, rolling onto their feet facing one another across the courtyard. Chests heaving, they stare at one another, then Voldemort's eyes shift. Alex follows his gaze and watches the Elder Wand roll to a rest.

I told you, it's useless to you." Alex grins.

Just then, the Avengers burst into view with the other warriors, followed by Nagini. On the side behind Voldemort all the Death Eaters rise and watch.

Nagini rises, ready to strike.

Alex turns, hand pushed out in front of her as she gets ready to defend herself, but she's too late. Voldemort grabs the Elder Wand.

Nagini's head drops towards the Avengers..

Alex watches in horror as...Bucky appears. With, one mighty swing, he severs Nagini's head. Voldemort freezes, watching Nagini's body thrash madly for a time before going still. The great snake's head tumbles end-over-end and then, as it comes to a rest.