This is a hard question.
CON is one of those stats which you get enough of, to survive. Then the rest goes into DEX/STR to boost damage (with DEX as priority for accuracy/crit in PVP). Too much and you start to give up on your damage.
The question is how much is “enough”? 50? 100?
maximum. 500 con and above.
huehuehuehue
/20 hue
my swordy got 120 total points (90 invested) into con and rest into dex
got top 20 pvp in my server for several weeks already
generally anything between 100-130 seems reasonable
you wanna have 30k hp ultimately
full con sw2 pelt1 cata3, coz you wanna survive the dmg, annoy the sh1t out of enemy, and sit till your team carry you and win.
works everytime.
cata is the best distraction in tbl
(im crying coz i thought we are gungho and hotsh1t, turned out we just meatshield)
Darn you catagoons! Though most catas I’ve seen have so much damage they can win the match for their team if they get the jump on them.
hrmm…
if im bill gates , im gonna buy over IMC and close down TOS
if u lack range, u need alot of con.
if u lack range + speed, u need even more con.
if ur server is, for god know what reason, completely lacking in magic class… then u need dex.
I usually go for 82 invested points (25k HP, naked) and then balance DEX/STR depending on build.
50 as minimum/starting is my personal preference for any sword build. I just then increase it accordingly depending on my playstyle for that build.
My cata3 has 70 - might increase later on depending on how many OHKO skills/combos R8 brings as well as how much 280+ magic mobs will hit. 
50 is kinda scary low, how much HP does that give you naked?
i saw some 2300-2500 magic atacks from lvl 290-300 mobs (300k hp)
Still holding on to my stat reset potion. So I will experiment with…
200ish VIT and 300+ DEX target for Lancer. No STR.
This Build sounds tempting too but the only concern is block penetration.
Does anyone know more details about lancer’s block penetration buff?
Currently 90…but after transcending my armor equips which gives you 1% base con…I need to put it to 100… to maximize its potential 
it adds 75% block penetration, and reduces the enemy block by 50% the duration is about 30 seconds and CD about 60.
that probably means that the actual CD is about 30 seconds.
Edit: just looked and it has 54 second CD and 25 seconds at rank 5, its going to be uptimed at lvl 15 though because the duration increases by 3 each lvl, (and the block penetration increases by 5% so its probably going to have 125% block penetraton at lvl 15)
its going to have 55 seconds uptime and 54 seconds CD so as you can imagine in the end it will be 100% up time
for the time being its going to be 25 seconds uptime and 54 seconds CD.
Pretty promising IMO