Window to Polis

Now when we're done with the diplomatic stuff, I will tell you this: you need to give this crystal to the portal keeper girl and tell her I order to establish a connection with Polis as soon as possible. We can't wait.
How can we just leave them to the demons' mercy?!
For now, you will walk through this portal alone. Then we'll see.

You want me to add a new city to our net? This is so exciting!
Unless you were given an explosive alchemical artifact instead of a connecting crystal. I hope you can tell a real crystal from a fake one.
Because I can't.
...
That was easy. A new pathway to Polis is ready. Here you go!