Since I always loved the necro as it is in Diablo 2, since it is the only necro in all games that TRUELY is a necro :>, I have started a new one. Earlier I always wanted to use the poison nova, but everyone told me that it is broken and doesn't to any damage. So is this now fixed and usable ?

Poison Nova was never broken.

What you need to learn is getting used to the fact that poison damage is dealt over time. Poison Nova it's not a spell that does more dmg when spamed like crazy. It does not help your damage output to hit critters with 5 spamed PN's or only 1.

All ever changed was when 1.10 added synergies.

Pre-1.10 lvl 20 Poison Nova did 400..440 poison damage in 2 seconds.
Now a full synergised lvl 20 Poison Nova does 2000..2200 poison damage in 2 seconds.

Don't know who told you that poison nova was broken, they were dead wrong. Maybe they were talking about the poison skeleton magi? They are broken, most definitely.

Poison nova is tons of fun, and what's great is that it's damage is dealt over TWO seconds! So it's easy to calculate how much damage you're doing per second. It's definitely a hell-viable build if you have a good merc and a golem for a meat shield. A high level lower resist can break a lot of poison immunities.

Almost everyone told me so.
I asked in 4 Diablo 2 forums, pals that play the game since release, and everyone told me, that it is broken and does not deal it's damage or doesn't apply to something else, as it normally should.

Since I read something that in 1.13c the poison nova was changed, I thought I ask about it.

Since I realy would like to test a pure skellemancer with poison-a-lot

I just started playing and my first toon is a poison necro. its sooooo much fun and Pnova is !*!#. So easy to gear up too, just get trangs haha. It slows your cast rate in ghoul form but you get +25% poison skill damage and -25% enemy poison resist, and if you max lower resist it should come up to around 65% with your gear.

I dont even have the best stuff yet and I can still run into a pack of 30 monsters and 1 shot them all without lower resist.

Or cast lower resist (over a football field radius at that rank) and cause mayhem. You can even break through lots of monsters poison immunities AND..... corpse explode monsters that have unbreakable immunities. Its a TON of fun even without outstanding gear.. (but with the right gear is just rediculous)

One thing i like about poison nova, is that the duration of the poison doesn't increase at all with extra skill levels. I haven't done the math yet, but because of this, I am of the opinon that poison nova can quickly become the most damage-per-second poison skill of all.

I'm almost always a summoner necro (with some P&B thrown in for variety), so i've been over the skill trees several times. With all that everyone is saying about poison mages being broken, well, I don't know about that.... but I do know that they suck more than any other type of summons. I have done the math for the poison skele mages, and with more points into skeleton mastery/skeleton mage, their poison actually becomes WEAKER!!! Yes, the damage increases with each skill lvl, but the poison duration increases more, resulting in a LOWER damage-per-second value.

Hey, that gives me an idea for a possible improvement! How about in future patches, one of the synergies for poison dagger/poison explosion will, instead of increasing poison damage by 7% or whatever it is, will DECREASE THE DURATION by 5% or so! Because, again, with poison damage, its all about damage-per-second, and you can raise that number by increasing the raw damage.... or decreasing the time.

Poison Nova works well.

I'm playing a Nova necromancer and I can clean the chaos sanctuary alone easily.

Indeed, there is no imune poison in the sanctuary. You are not even forced to use Lower Resist (skill) if you use Death Web (weapon).

Enigma can be useful for this build, probably more than Bramble, because it permits to go to the sanctuary without fighting (because there are imunes to go to the sanctuary).

But, even if it works in "player 1", it will be hard to do it in "players 8", when a lighting sorceress will do it easily (but with Infinity).