Well that's put the cat amongst the pigeons in my game. The party had defeated Aearisi and had one of the party (Layna) had attuned to Windvane. Then Layna and one other party member decided to reconnoiter down the wormhole. Both of them are very sneaky. They didn't stop at the fane of the eye - they kept going down and then, through a mixture of sneakiness, bluffing and bravado made their way all the way to the node without incurring any combat at all.
Layna was contacted by Yan-C-Bin, and gained the knowledge of creating devastation orbs, as well as how to finish the ritual to summon the prince into this plane. She was very tempted to do so, as she could have wrecked bloody revenge on those who had wronged her in the past, but managed to keep her focus and followed the clues to the realization of how to close the portal. She threw the spear into the portal and then the two of them scarpered. As fast as two rogues can.
From my point of view, that is going to make the other three cults sit up and take notice. Now they can no longer slowly gather their strength, they need to take action and that means taking control of the local area.
This was two 5th level characters managing to get all the way down to the air node and destroy the portal. I was so sure that they were both going to die, but they really did play that well and escaped without a scratch. It was very high tension stuff though. One of the players stated that it was probably the most tension filled session he had ever played.
https://deathgrind.obsidianportal.com/adventure-log/down-the-wormhole
Fun fun fun.