Mysterious letter

The text of the letter reads: 'Hello! As an experienced adventurer, you will surely be interested in the news that everyone in Merac is talking about. A few days ago, an... arch appeared near the city. Even the most experienced magicians cannot understand where it leads, and no one has been able to pass through it. You must be eager to set out for Carron, aren't you? Wait a little. Come see me first.' - Captain of the Royal Guard of Randola.