my necro build - does it need improvements?

Not very constructive Gen.

As a rule of thumb, PvE gets easier the more extreme your statline is. Which is to say: if you have tons of spike damage or tons of survivability, PvE gets much easier.

I would honestly look more at your armor than your traits/weapons/utilities. Are you in full level 80 exotics? What prefix are you using? Typically Berserker (Power, Precision, Crit damage) or Soldier's (Power, Toughness, Vitality) cover the extremes, but I'm less versed in the ways of the necro.

I would definitely recommend some summon skills. Flesh Golem elite and the Bone Minions are pretty good from what I understand. Hounds has a really short duration and they die pretty easily, and that well has a long cooldown for such a short duration.

Hey, I saw your thread and tried to look at your build but I had some issue where i could only see what i assume was your first slot skill and could not see what you had set for your other traits. If i am correct I am assuming this is a staff based condition build? If so the only real recommendation i could make would be in a way to echo V and to say that your 7-0 traits may be the only issue you might be having, however a condition build rarely needs or uses too many minions as it is usually taking up slots that could be used to apply more conditions to your opponents.

Below I added some of the builds that kind of came to mind as a few different necromancer play styles. All of these builds and more can actually be found a bit below your post on our thread and most if not all of them kind of have a write up to help explain the ideas of the build and how they are played. Maybe somewhere in there we can find anything that you might like to try or maybe some inspiration to help you figure out your build. If you have any more questions or anything, you can always find me in game, my name is shira nolar or alina veer in game and i know there are several other friendly necro players who can maybe answer any questions or help you out with whatever is needed. Plus if you need help with any of those spots don't be afraid to ask in guild we have all been through orr and we all have those areas that hold a special disdain in our hearts.

en.gw2codex.com/build/23336-siphon-necro
This build is very heavy in use of minions and some wells to gain a constant health regen. The weapons for this build are actually dagger/focus and staff, and the armor is Clerics gear which is power, toughness, and healing power. This build is very heavy on allowing you to jump in and tank and melee anything you fight while your skills, your minions, and if you have them health regen food keep your health at max for the whole time. You do not have an overabundance of damage yourself but the minons do supplement to allow you to deal a fair amount of damage for a tank.

en.gw2skills.net/editor/?fQQQRBIRtG2IkWmelmyG/eCY6B3jLO8hejZQ8wA;TEAAzA
This build is a variation of the one above preferring to use mainly wells as your form of damage and health regen along with condition damage making this build a candidate for more than likely apothecaries gear which is condition damage, toughness, vitality. This one is a more damage tick oriented build so you will see a lot more numbers at a constant rate.

en.gw2codex.com/build/19237-necromancer
This build is very different as it does not use minions but instead relies on pure condition damage and spreads the conditions from one person into the entire mob. the play style is a lot less tanky so you will be doing a bit more dodging and moving however you will be able to take on just as many mobs in a possibly quicker time. There is a full write up for this build here: jaded.boards.net/index.cgi?action=display&board=builds&thread=80&page=1#1159

I like shira's condition build. its fun.

en.gw2codex.com/build/22130-necro-hybrid-mm-setup
I use this to farm karka solo. its pretty rugged. I dunno how it would do in a dungeon cuz...well, i suck at team play lately and side projects mean when I'm actually online the game does not have my focus.

Honestly? It's mediocre. @+30% of condition damage its not the raw hit I expected and keep planning to swap it out. But then I get downed, and there is that one sliver of health on a mob that runs up to me for the finishing blow and --boom -- rally. Life Leach is just so...weak compared to Mind Blast or even Discharge Lightning; its like Anet forgot that any hit interupts a down player... The boost to fear seems to help me rally when the rest of the build actually crumbles.

Of course, if my horde has crumbled enough for me to down? I'm already in pretty big trouble.

I keep planning to go 15-30-25 or 10-30-30 and get Foot in the Grave because I don't spend a lot of time in shroud most of the time; just long enough to pop my skills once and then right back out.

Even thought about a 5-30-30-5--just give up on tactical use of death shroud and play full blown minion master with LT as an extra heal for my horde.
Untested, but here's the theory:
gw2skills.net/editor/?fQAQNAW7djEal6ta2a0bKApHRf90TP6e7wjFQLA

Don't wanna derail the thread further though. Back to the question:

Terror is just so... situational on this build because its not built as a "fear spam" build (hmm...that would actually be kinda interesting...). But when you need it, and its there, it will make you smile