Welcome to dungeons!
Each Dungeon has a story mode and an Explorable mode. When you choose to venture into the explorable mode, you will have three to four different routes of completion, or “paths”. These paths differ in various ways, such as using different parts of the dungeon map, different enemies, and often different bosses. The most differentiating factor in these dungeons, however, are the objectives.
When you enter the instance, some NPC will be “hosting” the run. There are cutscenes that explain the story of the dungeon a bit, and then you will be given the option of which path you and your group will run. The paths are chosen by majority vote (through clicking the path in a dialogue box), but you should know what path the group plans to run before you eve enter the dungeon.
In your case of Twilight Arbor (TA), Up/Up and Fw/Fw (forward/forward) refers to TA’s optional explorable paths. This dungeon is different than others, as once you are in, there are multiple places in which you can alter course in your path (hence the listing of two paths per…path? :p ). In other dungeons you will choose the entire path in the beginning of the dungeon, which when advertised instead of listing “path X/Y” you will see “path 1” or “p1” for example.
“Zerk” is something you may see often. It refers to Berserker gear (power,crit chance, crit damage). Groups calling for these types of players are usually speed-clearing dungeons – rushing through as fast as possible to farm the reward. This archetype offers the highest damage but also presents the most risk, and usually (hopefully) experienced players are filling these roles.
