In Chapter 509 of "Fairy Tail," Mavis will be revealed as Larcade's mother. Meanwhile, since Kagura is also not capable of defeating Larcade, Mavis may be forced to fight her own son to save the "Fairy Tail" members.
Last chapter, when Makarov drew the "Fairy Law" to save his comrades, Larcade struck his attack afterwards. To torture his opponents, Larcade used his "Pleasure" magic that targets anyone who has already tasted the "forbidden fruit of pleasure."
Majority of the "Fairy Tail" guild members were left helpless, feeling the pleasure at the same time the agony of what Larcade's magic brought them. Despite these, there are a few left unharmed.
In chapter 509, rumors are rife that Kagura will stand up against Larcade to save her co-guild members. However, it seems like her powers are not enough that she was not even able to bruise here opponent. As predicted by Yonkou Productions, Kagura will be able to slash out the lightning blades from Larcade but she will still be struck by another of her opponent's attacks.
Meanwhile, according to Linali of Manga Helpers, chapter 509 will recall the history of Larcade. According to the user's spoiler, it will be told that the lighting-capable warrior was not loved by anybody which made him unable to feel any emotion. The same source has also a prediction that the nemesis' power comes from the jealousy he feels toward his uncle, Natsu, whom his father Zeref loves so much.
Now that even Kagura cannot stop Larcade, August suggests that maybe only Larcade's mother would be able to stop him. While he is saying it, Mavis appears in the background.
From these information, it appears that Mavis will be entering the scene as the only one who could stop Larcade's powers. As of the moment, there is little information whether both mother and son will share a battle to fight. With this, readers are advised to take everything with a grain of salt until the chapter is released.
"Fairy Tail" Chapter 509 will be released this week. For other spoilers about chapter 509, check the video below.