"I just have to kill the Straw-hat Luffy and then turn him into the marines." Blackbeard said with a grin.
"Luffy, he's my little brother, and I won't let you lay in a finger on him!" Ace growled viciously, and then he was shot at. The projectiles went through Ace and left him untouched. "Your nakama are rude." Ace said as the big guy lifted a building and tried to throw it at Ace. Ace used his powers to create a tower of fire to protect him.
Teach called off his men, but it was too late. Ace launched a huge blast of fire striking them all. Blackbeard recovers as his crew escapes. "Sachi the fourth division captain as you thought I killed him. Sachi had the devil fruit I was looking for! Whitebeard's rule - you find it and it's yours."
"so you killed Sachi and stole it." Ace said coldly, glaring Teach down.
"Ace your power is fire right?" Blackbeard laughed as he began to summon his power. "I am Darkness!"
"Darkness?" Ace said holding his guard.
"Aye and I can't be killed by the likes of you - of all the "devil fruit" ever to exist - this one's the most evil of all!" Blackbeard claimed. Then he used his black hole technique to consume all the surrounding buildings. Next his darkness rose up into a portal, and then it emitted broken remnants of the buildings; which crashed down to the ground around them. Ace took his turn quickly by releasing his hitarubi attack and then ignited his hidaruma attack when it surrounded Blackbeard. Teach fell and started rolling around like a madman until his darkness consumed the flames.
Zari was far away, watching this long awaited battle. The villagers ran up to where she waited and watched. Blackbeard held his palm, aimed at Ace, who seemed to be pulled by some invisible force. Zari watched him resist and lose his hat to the force. When Ace was pulled into Blackbeard's grasp, Blackbeard punched him in the stomach and launch him back into he remains of the buildings. In response to seeing that, Zari's hands shot to her mouth and tears welled in her eyes. Teach talked as Ace stood.
Once again Blackbeard used that force to pull Ace in for another attack. Ace used the force to attack with his shinka shiranui. However, Teach karate chopped him in the neck. Then he reacted to Ace's attack and threw Ace back into a building. Ace grabbed his hold of his neck and then launched his juujika. Then he doubled over trying to breathe.
"Ace! Your strength is near legendary! Join my nakama!" Blackbeard offered once more the chance.
"Yielding my powers to you forfeits the point of being born human and I don't live with regret! You got that idiot!" Ace growled as he struggled to stand.
"The world would have been yours for the taking! But now you die in darkness!" Teach laughed wickedly. Ace summoned his daienkai as it developed into entei, an enormous fireball resembling the sun. Zari gripped the edge of the rocks she sat on, tears streaming down her face. Heavy sobs shook Zari's body as she watched this epic also pulled out all the stops for a final clash.
"Light! Dark! There's only one winner!" Teach shouted with a wicked smile.
"I will make Whitebeard king!" Ace said coolly. Then they charged at each other.
"ACE!" Zari cried out with all the air in her lungs. The two powers clashed as her cry rang though the air.