(Author's notes)

"SHOUTING"

"Speaking"

'Thoughts'

*actions*

// sound effect or flash//

I don't own Fairy Tail nor do I own the characters

Last time
As they were walking they passed Silver who said "wow you survived and without a scratch your lucky even we don't get out unscathed just ask those two" he said as he pointed at the two mummified creatures and smirked before saying "but I wouldn't try that again he won't be as forgiving as the last time"

Now

After the group were locked back away in their cell the rest of the guild started to ask them questions about what the guild masters looked like and how cruel they were. After a few minutes Erza said "Natsu has betrayed us" the others started to think about a Natsu but couldn't think about one until they thought back a little more and remembered the fire dragon slayer and they said "what do you mean he betrayed us?" a few seconds later a chuckle resounded throughout the entire dungeon a dark chuckle at that let's just say that some of the wimpier fairy tail members shit their pants.

The sound of footsteps resounded through the dungeon and a second later Natsu appeared at the bars of the cell and said "I would watch how you use the word betray because I actually didn't betray you at all" at that Erza shouted "to hell you did" after that she managed to remove her cuffs with sheer force and attempted to use her equip magic on him but found she couldn't and said to Natsu "why aren't my powers working what did you do?" the pink haired wizard said "it's quite simple really but inside the Tartarus guild the walls are lined with Anti-magic lacrima which are the enforced with metal strong enough that even metallicana couldn't even get through it the only way to get your powers is to get outside but as you can see that isn't happening anytime soon".

A second later a speeding fire bullet the size of Elfman came flying in the direction of Natsu who just put his hand out and caught the flame and said "Keyes if you so much as send another fire ball in my direction I will burn you alive are we clear" a second later a very scared "yes master END" was heard from down the corridor.

The members of the fairy tail guild watched as Natsu ate the cursed flame with no problem and then Gray said "wait E.N.D" Natsu looked at the boy and said "took you long enough to figure it out ice princess" after that everyone looked at Natsu who's clothes started to burn and change into a skin tight top with the Tartarus guild mark in the same place as Gray's fairy tail guild mark with a Tattoo appearing down his arms for E.N.D (picture below)

All of the guild looked in shock as Natsu changed and Cana said "what the hell how can you be END your weak besides END is a book not a person" . Natsu smirked and said "it's quite simple really if you know what END stands for, do you?" after the captive guild shook their heads signifying that they didn't know Natsu lit a flame on his index figure and wrote out in the air (kind of like Voldemort in the chamber of secrets) 'E.N.D = Etherious Natsu Dragneel' after that the rest of the guild members were in shock as their friend basically just told them that he is the most powerful demon of zeref.
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Till next time
p.s. sorry it's so short