If you can get over to Wizard101 Central, please do yourself a favor and go read this post by Willowdreamer. Ms. Willowdreamer just purchased issue 127 of the Beckett Pokemon magazine, and within those pages there is pretty much the entire plot to the prequest laid out.
Here's a snippet of what Willowdreamer reveals from the article:
"It's up to you to travel across the Spiral and defeat a cadre of villains to get the pieces Balestrom requires. Gradually, you learn more about these mysterious enemies, discovering that they are the Shadow Weavers, a secret order of Wizards with sinister plans.
Upon successfully decoding Balestrom's mysterious message, you learn that it originates from a long-lost Marleybonian survey team from the Spiral Geographic Society, a league of explorers who set out long ago to find the lost world of Celestia. According to the message, the explorers believe they have stumbled upon an important discovery, but they are trapped and in great danger!"
The Shadow Weavers appear to me an amazing race of insectoids.
Here's one of the pictures from the article:
I'm not going to repost the entire thing from Central, but you should definitely head over there and give Willowdreamer a thanks for the info!