TIME SHINANIGANS.
SpoilerMy prediction is that Eclipse 2 is actually the FIRST project, which doomed the city, and Eclipse 1 is actually the project to save it.
Also, nice to see they actually note that Arcadios living despite lava was bull****. Also, I'm betting the princess is a Jade Dragon slayer.
Finally, we have no subtlety from the mangaka. Next chapter is three woman fighting. The chapter title? Threesomes. Stay classy Fairy Tail, stay classy.