"Fairy Tail" chapter 505 proved to be one of the more heartbreaking chapters as the third guild leader, Makarov, sacrificed his life to protect every guild members who are on the verge of dying in the hands of Alvarez Empire soldiers.
In the previous chapter, Fairy Tail guild members continue their advance to the guild. However, they were slowly getting overwhelmed by the Alvarez Empire soldiers. Unable to stand what he sees, Makarov decided to cast the "Fairy Law," which has the ability to eradicate those who have harmful intent against members of the guild. Despite Mavis and the others telling him to abort the spell, He went on and casted the powerful magic.
"Fairy Law" shortens the lifespan of its user and the length depends on the number of enemies affected by the spell. As the dust settled, Makarov was seen lifeless while Zeref and the rest of the Spriggan 12 members were shocked to see all of their forces knocked out cold.
"Fairy Tail" chapter 506 is entitled "Broken Bonds" and fans over at Reddit are led to believe that this is pertaining to Natsu and Gray, who are currently having a death match. After it was revealed that Natsu is E.N.D. all along, Gray is on the hunt to end his best friend's life as the demon from Zeref's book was the cause of Ur and his father's demise. Natsu, in a berserk state, could not stop himself from retaliating. Hence, fans believe it would take a combined effort from Lucy, Erza and Wendy to stop the two from fighting.
As they succeed in mending Natsu and Gray's relationship, Fairy Tail's elite members will now advance and take on the remaining members of the Spriggan 12. This will put Erza against Irene, while Gray will likely take on Natsu's brother, Larcade, Gildarts will face August and Natsu will go face to face against the Dark Wizard, Zeref.
For those who have yet to read the previous chapter, it is now available over at Manga Mint. Also, here is a video recap of the previous chapter courtesy of Zac2Uchiha.