Ehm... this story is available online and it is less than a 1000 words long, so you're really better of just reading it, but if you insist on a summary...
Some Rathi rebels are fighting Stronghold forces and winning. But then a Laccolith Titan shows up and they start losing. But then a Parallax Wave happens and the Stronghold forces are swept away.
What, you want more? We are entering an age now where pretty much all of the story is put into the book line. Any other storyline source that get produced up until... jeez, the Kamigawa vignettes I guess, are really just fluffed up commercials for the books. Their writing is generally okay, but their size means there really isn't much to review. There simply isn't space to do anything special.
- Skyshroud Elves thank Gaea. Which makes sense, as the Art of Rath book revealed Skyshroud originally drifted around the seas of Dominaria before it was scooped up and brought to Rath.
- "The Parallax" never came up in Nemesis, or anywhere else as far as I know. I'm guessing it is a side-effect of the coming Rathi overlay.
Okay, here we actually do have something to discuss!
The elves talk as if Eladamri is still leading the rebellion, which suggest it happens during the Nemesis novel. Yet that seems unlikely. In that book it is a huge plot point that Crovax, despite being the strongest competitor for the title of Evincar otherwise, failed to score a victory against the rebels. If his forces had a second battle in which he almost won, only to lose his troops to the Parallax, that would most certainly have come up.
So I would say that the only explanation for this is that story takes place during Nemesis's epilogue, or shortly afterwards: before news of Eladamri's disappearance becomes widespread, but after Crovax is named evincar and is campaigning to secure his reign. This would also allow us to tie the Parallax to the Rathi overlay, since the overlay doesn't begin until the last few pages of the book.
Aaaaaaand... that's it! You've been warned, there will be more of these mini reviews in the future. Next up is the Prophecy promo comic, but after that it is back to a proper book! (Or, well, proper... it's still Prophecy...)