i'm asking if anyone know if there is a "master list" of primary and secondary special attack abilities that don't affect PVP combat? I once spent over a year trying to use *Mortal Strike* on other players before someone informed me that Mortal Strike does not work in PVP combat. ... are there any other special attacks that don't work in pvp or are severely nerfed. for example: "Does bleed attack" work in PVP?
It's not that mortal strike "doesn't work"; it's more that it's not effective given apples remove it and there are scripts to automatically eat an apple if mortal'ed. With the addition of cleansing winds (mystic) if there is someone with mystic it's also quickly removed. The same could be said for lethal poison. It does proc and "work" but with the auto scripts chugging cures until it's gone; that isn't super effective.
If you are talking about special attacks that are effective in PvP then it's going to be pretty limited and confined to Disarm/Armor Ignore/Double Strike/Dismount/Moving shot (if using a bow). One other special that you can use that is useful but isn't as useful against a scripter is Nerve Strike; you will get the damage from it but scripts will auto pop a trapped box to break paralyze from it. There are some other specials that are useful in certain situations like fenzied whirlwind if fighting a mage (and trying to disrupt his spells) but I'd say they are much more limited and would depend on your template.
Side note: Your thread title says "Mods" but your post say "Specials" which are different. Specials are the ability linked to a given weapon whereas Mods are properties any weapon can have.
Just for good measure in case you were wondering... From my limited interaction with PvP over the past 5 years I've kind of seen these are the effective mods for the average person looking to PvP:
Splinter
Hit Lightning (or other spell)
Hit Lower Defense
Hit Lower Attack
Spell Channel/Faster Casting/Damage Increase depending on your template
.......... also, does the "Block" ability work?