Fans just witnessed the much-awaited E.N.D. awakening of Natsu Dragneel during Fairy Tail 503. This part, however, as theories suggest could be a pivotal moment for NaLu shippers.

The battlefield has descended into chaos, starts Fairy Tail 503 while Natsu and Lucy were shown still tied up -- the former unconscious while the latter is trying to break free from the chains. Dimaria appeared, mocking Lucy's pitiful condition and further toying with her by stripping her out of her bra. As Lucy complained, Dimaria said that she would also strip Natsu so they'll be in "the same boat." Dimaria then turned to the unconscious Natsu, grabbed him by the head and pointed out that he might be dead already considering that he's barely moving, much to Lucy's disbelief. Dimaria noticed Lucy's huge eyes and thought it would be a good idea to gouge them out. Just as Dimaria was about to plunge the knife into Lucy's eyes, Lucy screamed "Natsu" or rather think about Natsu, the frame shifted into an unconscious and naked Lucy lying on the ground.

What happened after was an untold battle between Natsu and Dimaria. After Lucy regained her consciousness she found blood splattered on her face with Natsu nowhere to be found and Dimaria all beaten up while muttering "Monster." While Hiro Mashima left this unsaid, this could only mean one thing, Ethereal Natsu Dragneel has been awakened.

Natsu was later shown looking for Zeref but bumped into Gray instead. Fairy Tail 503 ended with the afterwords, "Their two fates, while being strung along by Zeref will now violently and tragically clash," hinting that a major battle between Natsu and Gray might possibly happen in Fairy Tail 504.

Fans are so hyped by now, waiting for Fairy Tail 504 considering that the previous chapter wrapped up in such a major cliffhanger. As previously reported by HNGN, the upcoming chapter might show the very highly anticipated fire and ice battle between two good old pals Natsu and Gray.

Meanwhile, as fans start to worry about just what kind of monster Natsu transformed into or whether the main protagonist would die in the upcoming episodes of Fairy Tail, theories about the possible weakness of E.N.D. has been circulating around. One theory suggested that Lucy will be Natsu's catalyst, owing to the fact that the two share some sort of special connection.

Although the scenes after the eye-stabbing parts have been blacked out, a Youtube channel suggested that Natsu started attacking Dimaria when Lucy called him out. This indicated that Lucy could be the weakness of E.N.D.

This means that if Lucy calls upon Natsu, then he will be able to battle his E.N.D. form. As such, the original Natsu could still hear Lucy and still want to protect her. This is basically saying that Lucy could be the person who could calm Natsu down if Natsu ever loses his sanity to E.N.D. With this development, it would prove just how much Lucy means to Natsu and kicks off Mashima's promise of a happy ending for the two main characters.

Natsu's fate is still however yet to be revealed in Fairy Tail 504 that will come out on October 5.  Stay tuned for more exciting updates!