Chapter 499 of "Fairy Tail" does not bode well for Juvia and Gray. The two will have a hard time facing Invel and looks like she will have to sacrifice her life in order to protect Gray.
Juvia will rather die than hurt Gray, reports suggest. However, Gray might not stay safe as he will try to stop her plan and while doing so, discharges an Ice Blade attack that harms him as well as Juvia. This shocks Invel as he had not expected such a thing in the wildest of his dreams.
Later, she casts a blood transfusion magic on Gray saying that she will live inside him and she is not sad as her life belongs to him. The blood magic restores Gray's life and he recovers but the death of Juvia breaks something inside him.
He gets mighty upset as he thinks of her as more than a friend and her death angers him so much that he challenges Invel. The confrontation leads to an intense battle between the two, the consequences of which, are definitely going to be disastrous.
Notably, chapter 498 ended with a big cliffhanger, indicating a forced battle between allies. According to reports, Invel displayed the high level of his power and pulverized Gray completely, shattering his Ice Molding magic attack as though it was a cakewalk for him.
He also revealed how he was able to do it, stating that he is the purest of ice mages and thus, the strongest. He can control the essence of ice and freeze anything that he wants. Realizing his might, Gray decided to use Devil Slayer Magic which is going to lead to the event that will cause a forced fight between him and Juvia.
Some predictions also state that Invel might defeat Gray in the next chapter and in all likelihood, Invel's revelation about his power has led to the prophecy. Well, the spoilers are quite intriguing and tragic as well but till the chapter sees the light of the day, everything should be taken with a pinch of salt.