"Alright" Hades replied as he reached for Karna's temple. Karna did not move and allowed him to transfer the knowledge required to create a devil's heart.
But as a few seconds passed, his eyes widened and looked at Hades who was smiling. Karna realised that Hades was not only transferring the required equations to create a magic reactor, but he was also including countless spells including Amaterasu x 1000, static chain and finger pistol.
Hades was transferring the most important spells and creations he had made in his entire life; he was entrusting Karna with everything he had ever achieved in the field of magic till now.
As this was happening. The clouds near to the island began to sparkle with yellow thunder and suddenly, it struck up on the deck of the Grimoire Heart's ship.
Karna turned around to find Laxus standing on the ship. He looked at his arms which were now made form death element and sighed.
'This will be hard' He thought as he saw Laxus get angrier the moment he saw his hands.
After a tense few minutes.
"So please get them all to Mavis's grave Laxus" Karna told Laxus who had calmed done after being convinced by him.
"Alright fine" Laxus agreed grudgingly and then turned to Hades with a furious expression. "We are not done yet; do you understand that old bastard"
"We will see to it when its over my child" Hades calmly replied as he knew he was in the wrong this time.
Laxus scoffed but then turned into pure lightning to gather up every fairy tail member in the island and get them to Mavis's grave so as to complete Karna's plan. He may not know what it is, but the seriousness shown by his brother told him that it was way more dangerous than anything Fairy Tail has encountered till now.
As he saw Laxus leave, Karna turned towards Hades again.
"You should leave and go meet Warrod. He knows the rest of the plans I made for the future"
"But what about you, the earlier spell was aimed at making sure that none of the Fairy Tail members would have the ability to use Fairy sphere. It means that some kind of danger is coming towards this island that warrants the use of that spell. Isn't it safer for you to leave right now with the other members.
And if you are thinking about the importance of this island, the Tenrou tree spell can be recreated in another place if needed. And if its sentimental, you don't need to think about it that way. Mavis would rather have all of you safe than lose your life fighting for an abandoned island." Hades advised realising that Karna was planning on staying and confronting what was coming towards them.
"Its Acnalogia" Karna gently replied making Hades freeze at the realisation.
At the same time, he realised why Karna wanted to confront Acnologia instead of escaping back to the mainland.
If Acnologia is not satiated, he will target the nearest living landmass, the war that will start because of it has a good chance of burning down the entire continent.
"That's all the more the reason for you to leave!. Why the hell are you still standing here for? I will handle Acnologia in your place" Hades exclaimed, alarmed at the decision made by Karna.
"Again, master Precht I have a plan and trust me when I say this, not even a single one of the fairy tail members will perish by the black dragon's hands. But I want you to leave now so that my plans for Ankhseram can move forward" Karna insisted with a stern tone, implying that he will not take no for an answer.
Hades realised that he cannot convince Karna, so he begrudgingly agreed to the plan.
After a few more minutes….
"I hope you survive my boy, I really hope you do" Hades wished as he disappeared with the Grimoire heart ship. Even though the fight between them had destroyed many parts of it, the teleportation magic worked without any problems.
Karna stood on the beach as he watched the ship disappear from his eyes. He had made sure that most of the grimoire heart members were teleported into the ship so that Hades can take them away. But he was unable to find the fire god slayer. Karna was sure he was still somewhere in the island after losing in battle with Natsu. But for now, he managed to get a saint class wizard as his ally.
'This will make sure that Fairy Tail will be safe in the seven years we are trapped within the fairy Sphere' Karna thought as he teleported to the centre of the Tenrou tree where Mavis's grave was situated.
The moment he did, everyone came close to him, asking him about what was happening. Most of them were worried about the injuries that Karna had in his body currently. But he manged to calm them down by saying that he was alright and the wounds can be healed later.
But he still tried not to look at Cana who was staring fiercely at him right now. He knew that she knows about him using the horse talisman on somebody else instead of healing himself at the time.
Mavis then floated towards Karna.
"Karna, I don't have the information on how to create the Fairy sphere. Ankhseram manged to delete the memory" she said while looking guilty. She blamed herself for not finding out the true reason for the curse that she suffered all these years.
Zeref had figured it out, as his conversation with Ankhseram indicated it. Karna too had found out since his actions indicated that he had figured it out before. But Mavis had not figured it out. Even though she was praised as the fairy tactician, she was still unable to find the root of her own problems.
Suddenly she felt someone touching the top of her astral form.
"You don't need to blame yourself for it Mavis and don't worry there is still hope" Karna replied as he contacted the system in his head.
'System'
[Acquisition completed. Modified Fairy Sphere spell]
A/N- hope you like it.