A/N Here's the new chapter! They return to the guild to tell the master about the situation! This is the start of an arc, and I have no idea how long it'll be or what'll happen, so sit back and enjoy the show!

About a day later, they returned to Fairy Tail. They immediately got down to business, and Lucy was the one that requested a guild meeting.

"Master, there is something important we must speak to you about," Lucy said.

"Aw, you're back! And, I assume this has something to do with your mission?"

"Yes. Zain has something important he needs to tell you."

"I'm listening."

Everyone in the guild was faced towards, Zeref. Lucy gave him a reassuring grin, since she knew he wasn't fully comfortable speaking to others, yet. He nodded, and prepared to give the information.

"When we entered the room of the murder, we came across some ritual marks. The man was made out as a sacrifice."

"A sacrifice to what?" Levy asked.

"That is the thing. My theory is that the sacrifice was made to the Trinity. They are three war gods that are not known for being friendly. In order to be sure, I need to go to Alkatasia. There in an ancient library, I may be able to find the info I need, so we can put this to a stop. If not, the damage to our failure can be catastrophic."

"Psh, gods. How do we even know that they exist? I've never seen such things," Gajeel stated.

Some others obviously agreed.

"Because, a god is the reason I am immortal."

"So, it is true..." Pantherlily muttered.

…

Carla's eyes widened. Visions of blood being splattered on walls, a city on fire, and Natsu crying while inside said flame, along with a hand being reached out in that direction flashed through her mind. Then, there was a flash of light, and the vision ended.

She gasped.

"Carla, are you all right?" Wendy asked, concern filling her voice.

"I'm okay," she answered.

Carla couldn't bring herself to explain her vision. She didn't understand it, she needed to learn more.

…

Zeref thought the exceed's reaction was odd, especially since she acted off right after he gave the explanation.

"Do you know anything about these gods?" Laxus questioned.

"The identity for one is unknown, but I can give you a brief description of the other two. I do not recall their names, since they are in an ancient language that has been long forgotten, but I can give you the descriptions. One is an angel that is said to wear golden armor, and wield a mace. There is another that was described as a fairy. It has no weapon, but uses pure magic that is even more deadly. I've never read anything about the last one, but I assume that it is just as deadly, if not deadlier than the other two."

"How do we destroy them?" Natsu asked, eager to get into battle.

"That I do not know, but I will have to use my magic, so it will be full of risks no matter what we do."

Zeref wasn't completely speaking the truth. He had somewhat of an idea, but it would involve Natsu. Natsu was his brother that was turned demon in an attempt to bring him back from the dead. An attempt that obviously worked, but in return, Natsu lost all memory of his previous life, including the brother that fought, so desperately for him. If Zeref were to use the Book of END that contained his soul, he would awaken Natsu's demon power, but also his desire to end Zeref's life, since that was part of the reason he brought Natsu back in the first place, since he knew that he wasn't going to be able to keep control of himself forever.

"Some of the First Master's power may come in handy, but we must choose wisely in which to use, because I do not think that Fairy Sphere will be wise, because the gods will probably be able to break it anyway, and I doubt that any of you will want to have anymore of your life taken away like what happened at Tenroujima," Zeref added.

Everyone agreed with that. They did not want to be separated from their friends ever again.

"However, there is another problem. From the chaos that will happen during the battle that will take place if we fail to stop the enemy from completing the ritual, we have to worry about Acnologia returning, since he is attracted to my power, and anything that creates massive death, and destruction. Oh, he is also after all the dragonslayers, so you all being there plus me will certainly draw him to us."

Zeref saw them all shutter. They only survived is attack last time, because of the Mavis's help. Hell, they didn't even know what they were doing when they cast it! It was pure luck that everyone made it out alive, or with even one limb still attached.

"And, what do we do about him? He almost killed us!" Natsu yelled.

"And, he would have, if not for your spell. I will have to find someway to deal with him, and I will look for ancient spells when we go to Alkatasia."

"What is Alkatasia, anyway? You keep mentioning it!" Elfman brought up.

"It is another continent," the master answered. "They haven't been on good terms with Ishgar, so they aren't mentioned much. Their government is militaristic, and they conquer as much as possible, but Ishgar has certain weapons to use against them, such as Etherion, which is the only reason Ishgar isn't one with them.

"Master Makarov, there is a separate matter I would like to speak with you about later, if you don't mind."

"Very, well. We will speak after this."

"Do you give me, and a small group permission to enter Alkatasia?"

"Yes, but we need precautions in case something goes wrong."

"There is an island not to far from there. You can keep some guild members there, and have someone use telepathy to contact everyone at times, but you will all need to conceal your guild marks, because Alkatasia isn't to friendly with mages from Ishgar, especially if they are from a guild, and since yours is well-known, you are even more at risk. This mission may get to a point where you need to call in other guilds for help, but for now, let's keep this between Fairy Tail members. We do not wish to cause panic, that will let the enemy know that we are on to them."

"I understand. It will take time to come up with a plan, in case the gods you speak of do get released, but just in case... give me a night. I need to think about some things."

…

Eventually, Zeref met the master in the master's office. There wasn't much there, but he did notice a picture that had the found

"So, you wished to speak to me about something?" the master asked.

Zeref blinked. He wouldn't have found the man, so quickly, if it wasn't for him speaking. The master was even shorter than the desk.

"Yes. There is the matter about Acnologia. If combat happens, he will most likely appear, especially if dragonslayers, and me are there. There are only a couple of ways I can think of to possibly defeat him. One: A dragonslayer unison raid. Dragonslayer magic sounds likely to defeat him, but the problem is that he was once a dragonslayer himself, so I'm not sure it would work. Another way is Fairy Heart. I could gain unlimited power, so that I could take him out, possibly along with the gods, if he hadn't destroyed them already."

"I would rather not resort to that method, since I don't even know how I would get it to you, and since I do not trust you fully. Perhaps, we should make an oath."

"I will comply. What should we make an oath on?"

"That you will only resort to this if necessary, and that it will only be for the sake of what I consider good, and that if you use this power to harm any of my children, harm will come to you in return."

"Sounds fair, but I am immortal, I cannot die," Zeref reminded.

"Then, I'll make it, so you cannot harm anyone else."

Zeref held out his hand, and the master did as well. They held hands, and glowing gold magic surrounded their hands, and arms. The master began to speak.

"I, Master Makarov, leader of Fairy Tail, will allow the dark wizard Zeref to use Fairy Heart, Fairy Tail's secret weapon, against the gods known as the Trinity, and Acnologia, along with any of their allies, as long as no harm will come to any of my comrades. If he fails to abide to these terms, then he will lose the power, and it'll go to whoever I choose. Zeref, do you accept these terms?"

"I accept your terms," Zeref accepted.

The master began to chant, and Zeref did as well. There was a spark, and they let go of each other's hands.

"It is done. I hope you do not forget our promise."

"I do not plan to. The only concern is that I will lose control of my powers."

"If you do, we will stop you. That much I can guarantee."

That was the last thing Zeref heard, before he teleported out of the room.

A/N That's it! This oath will be brought up again, I assure you. Yes, expect references to the manga from the Tartarous arc+. The events in the Alvarez arc won't happen, so don't worry about to many spoilers. Just know that I don't plan on having Zeref as the emperor, so their government will be different. See you next time!