There are two PvP types of Fencer builds you can make. Before I go on, Let's try to focus on what we need to put on for fencer stats. A Fencer mostly focuses on Dex, and Wisdom since Fencer mainly uses Magic power attack =]
What i recommend is to put at least 40 - 63 Dex, putting 40 dex will give u a minimum of 10 magic acc but putting 63 dex will give you 15 mag acc. It mainly depends on your preference. After accomplishing that, just stack the rest in to Wisdom, Do not worry about agility, physique, durability or power. As Fencer its not about tanking, its about dealing decent damage spam on the start of dueling.
FENCER/SHAMAN/BLADEMASTERAs you can see above, your fencer Hotkeys should look like this. On the 2nd page of the Hotkeys which is labeled as 10, you can buffs at every start of a duel whether its 1on1 or arena =P.
Before you begin... make sure u buff up Spring Cleaning, Malicious Mirror (reflects enemy skills), Toughen Magic(increases magic power), Burning Rage(increases physical attack power) and Concentration, increases Magic Accuracy by +20 when maxed.
Once you done that, Sneak attack(increases movement speed +60 for 10secs) and charge into an opponent while locking them with Stunning Strike and Crippling Clout. Stunning Strike prevents users from using magic skills and crippling clout immobilizes them. Now... the opponent cannot attack you for about 9 secs and can't move for 8 sec depending on the level of the skills you use on them. So during the time he is stunned, Spam all in order as you see above, the tricky part is that once you spam at the end of boundless leaves, you must use your mouse and click on mindless at the end =].
In Short, Once you have him stunned, you should have used out all your skills from left to right instantly without him hitting you back xD
The 2nd Type
FENCER/THIEF/BLADEMASTERThis is no different from the first type however the only differences is that you can't really regenerate MP as quick and you cannot reflect any skills. In this pvp combination, you do everything the same as Pvp Type 1. The only difference is that as soon as you use mindless slaughter, at the end of your combination you throw in hynosis quickly. Now, heres how u would do double damage, If your opponent manages to survives all your attacks which would be considered haxs, you can make sure he stays dead =]. Once he ish being hynosised, wait for your fencer cooldowns skills to fade away. Once the skills are fully cooldowned, respam those 5 fencers skills back at your opponent while he is still taking a nap. The advantages of using this built is the full usage of fast getaway and run amok + sneak attacking which allows you to engage and run away quicker giving you the upper hand to strike your target first.