Chapter 57:

The Avatar God Seed becomes weaker when one of the other God Seeds is eliminated, so now Natsu can actually perceive the speed of his attacks. Seems like the Avatar seed was always going to be beyond Natsu to deal with but as the others fall he will get his chance.

Lucy shows off a cool new Star Dress fusion of Aquarius and Scorpio, which lets her use a huge magic attack that can down some of the big minions, though it takes a lot of her remaining magic power. Still, Gray and Juvia are able to catch up with the Summoner Seed. The Summoner Seed absorbs Juvia since she uses her water form to avoid physical injury, but he is a tree essentially. He taps into her power to shoot water beams at Gray.

When Gray admits that Juvia represents his "power to live" or reason to go on, Juvia practically goes into seizure mode with love and embarrassment. This ends up actually making her reach boiling temperatures which bothers the God Seed.

Could be an interesting way to bring that particular God Seed down, though since the Chapter ended there it may take a bit more to defeat him throughout the next chapter.