Felicia, Marx, Quintin, and Blackheart lead the Silver Knights back to the Tomb of the Dilambian Pharoh, determined to end the Black Void's invasion once and for all. Since the last time they were here, the army of shadows and monsters has increased in number, and have surrounded the tomb. As Quintin approaches the stairs leading up, he is confronted by Phantas the Dark.
"You're back. I suppose this means Motrax was unsuccessful in stopping you." Phantas says, eyeing Reflection in the hero's hand. "I admit I am surprised you came all this way to give us a chance to stop you. With that sword, you have the power to end this war at any time by destroying the Black Heart."
"My people have never backed down from evil or turned our blades against the innocent. I'm not about to do either of those things today." Quintin replies.
"Innocent? You do know why the 'good' half of my master came here, don't you?"
"I know why."
"Yet here you are, ready to fight us in some attempt to save her?"
Phantas shrugs and draws his spear to fight, but before they can begin, the evil half of Blackheart calls out to him.
"It appears I am needed elsewhere. I suggest you use your sword to destroy the Black Heart before it's too late." With that, Phantas vanishes.
Blackheart walks up to Quintin and points to the top of the tomb. "I can sense a tremendous amount of dark energy at the top. No doubt that is where she is. Without the Void Gates, my other self will be trying to draw power from the Black Void itself."
"That would be a mistake." Quintin tells Blackheart. "Wonder is protected from the Black Void by powerful a powerful magic seal as a gift from the Guardians after Blackskull was defeated. If she opens portals to the Black Void using her powers, that magic will weaken her."
"I know. I felt my own strength wane when I first came here to help you." Blackheart replies. "If not for her having the Black Heart with her, the mere act of coming to Wonder would have destroyed us both. The Black Heart is strong enough to prevent her from destroying herself outright by invoking her powers as a Voidbringer here, but in its damaged state, she could still cause enough to herself - and me, to end this invasion prematurely with our mutual destruction.
"You're worried that if I corner her, she will choose to destroy herself, taking you down with her." Quintin says, understanding what Blackheart is trying to tell him. "I promise you I won't let that happen."
"You would know more about the magic that protects Wonder than I do, but I've never thought about destroying my other self or the Black Heart before. There's a chance I'll still go with them." Blackheart shakes her head. "I'm not afraid. If this is how it is to end, I want to go down fighting!"
Blackheart is the first to assault the tomb, gunning down several shadow fighters with her Angel Hunters, before drawing her sword and slashing through several more. Marx gives the order for the Silver Knights to charge, taking the lead alongside Quintin.
At the top of the tomb, the evil persona of Blackheart sees the enemy storming through her army, the sheer forces not even slowing down thanks to the good Blackheart and Quintin armed with Reflection. "My entire plan has failed. The Sorwins, Queen Felicia, and all of Wonder know this attack was not the work of my father. Now, SHE leads them against me! Her, of all people!"
Evil Blackheart slams her hand down, crushing one of the ancient bricks of the tomb as black blood pours from her clenched fist. She then turns to Phantas the Dark, her eyes glowing green as she reaches her hand out to him. "I require more time to gather reinforcements. To you I give you a gift; a portion of my own power to use against the hero who carries Reflection. Do not allow him to reach me under any circumstances!"
All at once Phantas the Dark feels an incredible surge of power. The phantom knight's spear glows with black flame as he rises into the air before shooting off like a bullet towards the battle below. Both Blackhearts fall to their knees, weakened by the empowering of the phantom knight.
Quintin is quick to catch Blackheart as she falls. "Are you all right?" He asks her. Blackheart nods wearily, holding the Black Heart up.
"The Black Heart's energy can sustain me, but not if she keeps using her powers so excessively." Blackheart answers, regaining her balance. "She knows I still have it, and that its power will preserve her too. It's also possible she doesn't care what happens to herself, to me, or to Wonder anymore."
"There's still the dark forces to deal with." Marx calls out, fighting alongside the Silver Knights. "If we are going to end this battle on our terms, we must hurry!"
"None of you will make it to my master." Phantas says, appearing before them once again, his spear and armor glowing with dark energy from the evil Blackheart. "My master has granted me the power to end this battle here and now!"
"It is you who will go no further." Felicia responds, drawing her own silver sword and walking right past her knights, Marx, and Quintin. "If you desire a battle, I will be your opponent."
"Felicia, no! He's too powerful as he is now." Marx explains, but Felicia raises her hand to her knight commander.
"Leave this one to me. You take Quintin and Blackheart to the top of the tomb and end this." Felicia orders. Marx nods, knowing better than to question the Silver Queen as he continues to cut a path through the enemy army with his enchanted greatsword.
"You really think you can defeat me Felicia?" Phantas asks the Silver Queen, twirling his spear as dark flames surround the phantom knight.
"I don't have to." Felicia replies. Phantas looks confused at first, but doesn't drop his guard as Felicia thrusts her sword at him, deflecting the attack with his spear. The phantom counters with a swing of his spear that sends a wave of dark flames at the Silver Queen, but they hit a magical shield that Felicia raises and dissipates as the Silver Queen lands a hit with her sword on Phantas' arm.
Phantas leaps away from Felicia and removes his helmet, revealing a face similar to Black's surrounded by green flame as he breathes a beam of green fire right at Felicia! The Silver Queen's magical shield protects her from the blast, but is shattered by the impact and causes her to stumble. The phantom knights leaps into the air and aims his spear at Felicia, but she regains her balance just in time and jumps gracefully to the side as he drives his spear deep into the ground.
"You're a very capable warrior Phantas. A pity you fight for one so selfish." Felicia says, striking the phantom knight with her sword as he struggles to pull his spear out of the ground. As Phantas lets go of his spear and jumps away to avoid further assault by Felicia, the Silver Queen aims her sword at him as light in the shape of a ballista forms around it, complete with a giant arrow aimed right at the phantom knight! Before she can fire however, Phantas thrusts his hands forward, firing a black ball of energy from them that knocks Felicia down, dispelling her magic and causing her to drop her silver sword, which Phantas kicks away from her.
"I didn't expect to find such a worthy opponent in the Silver Queen herself." Phantas says as he walks over to draw his spear from the ground. "However, this is where it ends."
"I agree." Felicia says, aiming her hand at her sword and casting another spell, causing it to move on its own! The silver sword goes flying right at the back of Phantas the Dark and impales him through his armor!
Phantas just turns around, holding his spear as though nothing happened. Before he can retaliate, the dark aura surrounding him starts to dissipate, and his body begins to crumple as his power drops, the sword now having an effect on him without Evil Blackheart's power to protect him.
At the top of the Tomb of the Dilambian Pharoh, Evil Blackheart has taken back the power she granted to Phantas the Dark to defend herself against Marx, Quintin, and Good Blackheart. "You made it past my phantom knight and defeated my army. It was not meant to play out in this way..." The two Blackhearts' eyes meet as Evil Blackheart's slitted blue Voidbringer eye stares into Good Blackheart's red Powerpuff Girl eye. "This is all your fault!"
"You're right. It is." Blackheart replies. "I never should have tried to contain you within the Black Heart. I should have accepted that we are one and the same, and destroyed you and myself when I had the first chance. Because I didn't, this war has spread to Wonder when it shouldn't have, and now Jason Brooks of Triconia roams this world again. I thought I could use my dark powers to do good deeds, but that clearly isn't going to work."
The evil Blackheart begins to laugh. Softly at first, until it goes into a full cackle. "You know what will happen then, don't you? If the Black Heart is purified by my destruction at the edge of Reflection, my half of our powers will NOT be all that you lose!"
"My powers as a Voidbringer will also be lost. I know." Blackheart says, lowering her head. She then raises her head, a bright smile on her face. "My power to draw energy from the Black Void for strength, my ability to know in advance what will happen to the people I care about, and even my power to open portals; all of that will be lost to me. You know something? I really don't care. If those powers cause more trouble to those around me than good, I'll gladly rid myself of them!"
"Then you are a greater fool than I thought!" Blackheart's evil self shouts angrily at her. "When I am gone and the Black Heart has been purified, you will be weaker than you have ever been before!"
Quintin charges at the evil Blackheart and attacks with Reflection, but evil Blackheart creates a portal that summons a duplicate Quintin dressed in black who starts to duel with the hero. Evil Blackheart then begins to fire a massive laser at her other self, but Marx steps in front of her and shields her from the beam with his sword.
"What I do is for both our sakes!" Evil Blackheart says, opening a portal and reaching inside with her other hand, pulling a blade of radiant light from the portal and putting it to her own neck! Before she can strike herself down however, Quintin jumps over his duplicate and drives Reflection through Evil Blackheart's chest! Evil Blackheart drops the dagger she intended to destroy herself with as her body begins to fade out of existence.
"I intend to keep my promise." Quintin says, removing Reflection from the dark commander's chest. "Blackheart, now!" he shouts to the good Blackheart, who nods and focuses her rapidly fading dark powers into the Black Heart as both of her disappear. Evil Blackheart explodes in a cloud of red and green smoke, as good Blackheart appears to be pulled into the Black Heart itself. The black gemstone falls to the ground of the tomb as the dark army vanishes, and all traces of the enemy vanish from the battlefield.
"Did it work?" Marx asks, looking around at their now quiet surroundings. The Black Heart wobbles on the ground a couple of times before releasing a flash of red light. When the light fades, the good Blackheart appears, dressed in her black gown once again.
"I came back!" Blackheart says, as though she were surprised to even still be around. "This means it worked, right?"
"Your evil half appears to have been destroyed. Look!" Quintin points as the Black Heart changes color to a blood red. "It seems your dark powers were absorbed by the Black Heart, leaving what remained of you intact."
"I feel so different now." Blackheart says, hovering into the air. "I must have relied more on my powers as a Voidbringer than as a Powerpuff Girl; it hurts to even touch the floor now. On the plus side, my vision seems to have improved."
Blackheart moves the hair covering her face aside, revealing a second red Powerpuff Girl eye has appeared where her evil eye used to be! She quickly covers her eye again, yelping in pain. "I guess I need more time to adjust to looking into the light now that I no longer have to shield myself from it."
"Then it's finally over." Marx says, looking over the battlefield at Felicia and the Silver Knights preparing to return to the Silver Castle.
"I'd like to stay in Wonder for a little while longer." Blackheart says. "Perhaps Banshee and Siryn can help me get used to using the powers I inherited from my mother now that I've completely lost my father's powers."
"I'm sure Felicia will welcome you to stay as long as you like." Quintin says with a smile. "When you want to go home, her magic can take you back to wherever you like."
As the Sorwins and Blackheart leave the Tomb of the Dilambian Pharoh, victorious against the dark army, far in the deserts of Triconia, the battle for Wonder was not yet over. Jason Brooks stood alone in the sandy wasteland, his arms crossed as his sinister laughter echoed across the land he once grew up in.