This is the location you need to visit to start almost all of the Brew Day quests.
It's the only zone in which you can use Beer Tokens buy event themed items from Balin Copperfoot. Balin also sells all of the Brew Day themed recipe books for 60s90c.
The Timorous Deep location is the quickest to access from any dock that has a World Globe. Alignment does not matter when entering.
You will be given a choice of where to exit based on your alignment: good characters are offered Antonica or Greater Faydark, for example. You can therefore use the Bar of Brell to travel quickly between those zones, since the wizard spire in Antonica is much farther away than the bar.
Exiles are able to exit to any zone, regardless of alignment! This allows exiles to use the zone as a fast way of transportation to/from Haven.