Stealth Fencers are a cramped as hell template, even without Poisoning. I have an old (pre-Tram) Stealth Fencer, haven't updated his template since i put Ninjitsu on him when SE came out. His template is 120 Fencing/GM Tact/80 Anat/80 Healing/GM Hiding/GM Stealth (120 with skill bonus)/GM Ninjitsu (120 with skill bonus)/40.0 Focus.
Believe me, Stealth Archers have it 10x easier. They can attack from a 10 tile range, and so therefore don't have to risk detection by sneaking into melee range. Basically, so long as someone is on the same screen as them, a Stealth Archer can hit them. Stealth Melee are pretty useless at Yew Gate, since closing into melee range is practically impossible because everyone is running around like a chicken with their head cut off.
My Stealth Fencer sure was fun to play though before Tram (even having to count steps). Post AoS was kind of fun too, since i could sneak up to someone, mount my Ethy Llama, swap to a Lance, and suddenly burst out of the shadows and dismount them, then run them down and kill them with a War Fork or Kryss. Then they nerfed the Lance's mounted dismounts
. Shortly before SE launched they made stealth auto-renew if you were walking, and suddenly everyone and their grandmother had a stealther.