Mysterious letter

The text of the letter reads: 'Hello! As an experienced adventurer, you will certainly be interested in the news that the whole of Merak is gossiping about. A few days ago, she appeared near the city... arch. Where it leads, even the most experienced magicians cannot understand, and no one can get through it. I suppose you can't wait to go to Carron? Wait a bit. Look in on me first.'- Captain of Randall's Royal Guard.