Just a comfy build I use to farm focus.
Put any other arcane if you want, I just find these work best for me with this build.
Great for Steel Path CC too.
Hope it helps.
(Don't forget to like and comment)

Possible Changes

• Use something like Synth Fiber to make the most out of Equilibrium.

• Zenurik's Energizing Dash can help you drop Dispensary faster and Energy Pulse to make the most out of it.

• If you want to make the most out of your Dispensary, you might want to consider using Health Convertion for (way) more survivability and/or Energy Convertion for even more strength in your abilities (or for replacing Transient Fortitude for more duration). Also Synth Fiber and Synth Deconstruct could help you utilize convertion even more often (a Djinn / Vulpaphyla with Reawaken/(Crescent Devolution/Panzer Devolution/Sly Devolution) could help you have these mods active almost always).

• If you can kill fast enough, consider Martyr Symbiosis as an extra layer of survivability with your Vulpaphyla.

• At some point, if you want, put a Forma for the Exilus Mod of your choice, whether that is Cunning Drift for range, Power Drift for that strength, Handspring/Primed Sure Footed for that knockdown, Rush for that speed and anything else for that matter. This will give you more flexibility build, adding that fluidity for when you want to change something on the build without having to use more Forma.

• If you want, use more Forma / Aura Forma to have Corrosive Projection (and even put Coaction Drift on top if you like the armour strip more, though I wouldn't do it) for more kills, after you have done the point above on the Exilus Mod. Another option would be Growing Power, if you know how it works and when to proc it, it is a nice option too. It also works great with Shock Trooper too. (Sidenote: "(Coaction Drift) does not work with Growing Power nor Power Donation")

• You can change with Capacitance (and if you want to Forma / Aura Forma, also Brief Respite) if you want more survivability for you and your team. Add Adaptation to make the most of the Overshields or Rolling Guard in higher levels to abuse Shield Gating and have time to cast. Lastly, careful with Toxin and Gas.

• Infuse Dispensary to 2, which is Speed, if you want since you will be stationary, meaning not meleeing on the other side of the tile from your Dispensary. That way you can use Shock with the augment Shock Trooper (Again, I would do it by using the Forma used for Augur Reach, but you do what you want, make the build yours), for that extra electric damage on your weapons instead of something like faster reloading.

• If you have some othe source of energy, like an EV Trinity or Energy Pizzas, instead of Equilibrium, you can use Augur Reach for range (what I would go for) , Constitution/Augur Message for duration or Streamline (or even Fleeting Expertise if that is your cup of tea) for efficiency. If you plan on going premenantly without it though, you might aswell change Dispensary with Fire Blast, for even more armour striping and CC (but also team healing with Healing Flame, if you want that, though I dont know what mod would be worth replacing with it).