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This build was designed with supporting your team as efficiently as possible. The weapons of this build can be altered to better suit your playstyle. The Blaze Sword is a strong option if the Duelling Sword isint for you. With this build, you may not be getting many kills, but using your bubble shield will be the main support you can offer to your teams success. Using the dome shield ability, to protect your team from ranged assault and to regain toughness at the right moment can be the best help you can offer. Use this skill freely to protect your team whenever needed. You’ll want to stick with your team throughout the mission, while your not weak, your abilities shine best when you allies are able to capitalize on the advantage given to them.

The Dueling Sword is a great precision weapon, capable of fast, accurate strikes. This is a great weapon that is able to perform against both hordes and elites alike.
Precognition is activated off of dodging. Getting Finesse will increase your attack speed, for a weapon that is already very fast, this makes is very viable to deal with hordes. Uncanny Strike helps deal with hordes as it increases rending, but its also pretty good when activated against elites.
For perks, Unyielding and Flak is ideal to cover a wide range of enemy types. More melee critical hit chance is good too if you prefer to go for Flak/Crit Chance.

The Voidstrike staff is easily considered one of the best staffs available for the Psyker. It has great attacks, both charged and uncharged, able to deal with hordes and tougher enemies.
It’s hard to go wrong with Blessings for the voidstike staff, for the build, I think Warp Nexus and Warp Flurry compliment each other nicely.
Gaining increased crit chance as your peril increases can really increase the offensive capabilities of your staff. To help compliment it, Warp Flurry will indirectly contribute to your peril increase, and then, crit chance. Warp Flurry reduces charge time on secondary attacks. The faster you build peril, the faster you’ll reach critical chance increases.
Carapace and Flak will cover many enemy types that are armored and that would be more annoying for your team to deal with.
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Curios are really flexible, with only a couple perks that really benefit builds. In this case, Toughness can be substituted for Health if required, but Toughness is still recommended. You might want at least 1 Curio to have 1 Wounds on it, wounds increase the amount of health bars you have. This is beneficial, especially on higher difficulties, as it allows some leeway if mistakes happen, or if you get overwhelmed.
Stamina Regen is really good and if you prefer it you can go for one instead of a gunner resist. Combat Ability is really useful, it helps make sure you have your bubble ability faster in order to support and protect your team more often. Gunner resist is also really good, but it can be swapped of for alternatives. Sniper resist is good, or Stamina Regen can help move around the field as needed.