Ultear: Even Hades didn't know much about their guild. I only know that their guild has mainly nine members who are called nine demon gates. I don't know anything else.... Axel do you know anything more??
Axel: I know a lot more, but if I tell you, you girls have to promise me that you won't tell anyone since we can't afford their attention now.
Cana: Why?? If we tell the rest of the guild they will panic and it's better they don't know about them now.
Erza: Can't we defeat them??
Axel: It is not that easy... Currently only Master, me and this Gildarts person could take them on and I am sure that Master and Gildarts won't be able to defeat a certain someone.
Ultear: Who is he?? Is he the Master of their guild??
Axel: Their guild Master's name is E. N. D. and he is sleeping. And I was talking about the Underworld King Mard Geer.... He is so strong that he can go toe to toe with Spirit King.
The three girls were completely shocked to hear that. They can only imagine how strong this Mard Geer was if he can fight with Spirit King on equal terms. The girls gathered their wits back again and Cana decided to ask the next question.
Cana: What do you mean by their Master is sleeping??
Axel: First let me tell about their members. Their guild is made up by demons from the book of Zeref.
Ultear and Erza were shocked and then turned pale when they heard that name and when they knew about the members. Cana heard that name for the first time so she became curious.
Cana: Who is this Zeref??
Ultear: Zeref is the legendary dark mage. He is the proginator of demons and dark guilds. Deliora was his creation along with Lullaby.
Axel: And in front of Tartaros members these two demons are just new born babies. These demons are not your regular enemies.
Erza: So what is their aim??
Axel: Their final aim is to awaken E. N. D. so that they can grant their creator his final wish. Death.
Ultear: What are you saying?? Zeref made them and Zeref is long dead??
Axel: According to who??
The three girls completely turned pale and started to shake.
Axel: He was cursed by the curse of Ankheseram, the curse of Contradiction. You care about someone they die and you don't care about someone they live but you become dark in return.
The girls were completely silent after sometime they gathered their courage and spoke again.
Ultear: How strong is he??
Axel: You cannot even start to compare. I can kill him if I use my full power but that will destroy the whole continent.
Cana: You must be joking right??
Axel: Erza do you remember the Nation Destroyer???
Cana: Nation who???
Ultear: Brandish Miu Nation Destroyer... One of the Spriggan Twelve of Alvarez Empire. She is one of the mid-tier members of them.
Erza: I met her... If I compare her to my current power then we are equals. I am currently slightly weaker than Master and Gildarts.
Cana: This is a scary world filled with scary people.
Axel: There are so many strong people in this whole world that you can't even imagine that.
Ultear: I just need to train hard. I can't lose hope now.
Axel: Exactly... That is why I am training you girls so you can stand against these kind of enemies.
Cana: Then I won't stay behind and I will train too...
Erza: I have decided long ago that I will become strong.
Axel: Ok girls now let's drop this depressing topics and cook something delicious and get cozy with each other.
Erza: I like that...
Ultear: Count me in.
Cana: Don't underestimate me...
~TIMESKIP THREE MONTHS~
Currently Axel was single handedly fighting Erza, Ultear and Cana. Cana has improved leaps and bounds and now she clearly was S-class mage hands down. She could even give Erza some trouble now using only her Card Magic. Ultear and Erza has also grown lot, though Ultear was left behind by Erza. Ultear was still her equal when they fought with each other just because of her overpowered magic Arc of Time. But if the battle elongates Ultear will lose because Erza's superior magic capacity.
Erza has now easily surpassed Master Makarov and Gildarts. Erza could use her most stongest armor Nakagami Armor like a whim now. With her current power she could use this armor for straight 3 hours. When she used this armor she could even go toe to toe with Axel because she could negate magic but she would eventually lose due to exhaustion. Ultear also became strong, she reached the level of Makarov. But due to her op magic she was equal of Erza but as soon as she started using Nakagami Armor everything became meaningless.
Axel: Come with all your might... Don't hold back...
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A/N: Guys I am thinking about world travel during the 7 years timeskip. They won't age in that time in which ever world they go. I am thinking about One Piece so that they could learn Haki and all the abilities of Marines... maybe even get some devil fruits...