Psyker
This weapon Blocks both Melee and Ranged attacks. Additionally, Block Cost is reduced by 22.5-30%.
5-8% Strength for 4.5s on Kill. Stacks 5 times.
Quell 6.5-8% of your Peril on Weak Spot Hit.
-8.5--5.5% Charge Time on Chained Secondary Attack. Stacks 3 times.
WARNING: this build is dangerous in stressful situations cause you have to monitor really well your peril, it's easy to get used to the auto quelling it gives you (and then explode cause your perill didn't autoquell cause unlucky wile you were distracted with the 4 special enemies around you) and to forget about the ult giving you peril passively so be careful and have always an eye on your peril meter even if it's just going up and down constantly.
This is my personal build. I'm still testing things. I love the Corvidae cult from the Thousand Sons so I wanted to do something that felt a bit like their battle stile. I know Ahriman doesn't fling balls of magic to the enemy lines but using a gun doesn't work with Scrier's Gaze since you need to quell peril wile you have it active to make it last longer. It gives you 20% crit, so with the staff you'll have 30% crit (u could go to 50% with max peril with the crit for peril pasive on the staff but you will be more realisticly at around 38-46% crit) aside from the passive that gives you granted crits for hitting weakspots, to really benefit from my ult I pick Solidity to make the quelling faster and Reality anchor so I can spam more and make more use of the benefits of the ultimate.
I know I'm not getting any of the on crit effects of the staff. But you get toughness back and 1s of inmunity to ranged attacks for every critical hit your weapons do so there is some benefits from getting crits (also you get more crit damage from the marks passive). The fire is not that useful cause the small things die on 1 shot when your mark passive is active and the big dudes wouldn't even feel it before you blast their head off with a charged weakspot shot. I would love to put the 2 shots on one crit but it's better to shoot faster constantly (cause you can maintain it pretty easy) than to have 2 sots once in a wile. The quelling passive also gives you big benefits, it helps you maintain your ultimate without having to quell constantly.
In this build you should try to always aim for the head, either with the voidstrike or with the sword. That sword I have equipped, is my favourite wizard sword cause u can quell peril, it has amazing horde clear with light attacks and the empowered attack i really fast.
I don't take the assail upgrades cause I've found myself not using assail for anything more than relieving myself from trash mobs around me. The voidstrike staff is just better in my opinion. So I can use those two points for battle meditation and warp rider. This two talents plus the venting on weakspot trait, usually make me fluctuate at a high peril on horde moments, making the venting less frequent and giving me even more damage. But I'm still considering changing the quelling or the faster charge passive of the staff for the higher crit at higher peril, since it fits the build so well. You could also use this points to improve the ult (either to get more speed or be mor tanki)
I've tested the other passives: Empowered psionics can be used with this build if u want to use brain burster but you will miss on all the extra damage (and fun), use Warp siphon if u like it more but I think it goes to waste since when using the ult you loose the charges and it's redundant since you get a lot of warp generation reduction with the ultimate (20%) and you quell a lot of peril already by hitting weakpoins and killing enemies (cause of battle meditation), Disrupt Destiny is fairly easy to gain and maintain with the voidstrike staff and they buff all the nice things that we want: Damage (15%) critical damage (30%) and weakpoint damage (37.5%) (it also helps me see the enemies in dark alleys with the marking thing since it's hard for me to distinguish the min the dark) the key to this passive is to kill the shiny enemies aiming for the head (eider with voidstrike or the crystals) and NOT stressing yourself about maintaining the charges. Seriously, you recover them really fast (one shiny enemy headshot kill is 3 charges) (i take the time extension anyways cause 15s go away in a heart beat so you would loose them too often).
And by the way the 10% weakspot damage on the staff is still under testing, i don't know if it will be better than buffing the damage to the more resistant armoured enemy.