Tridolong Go Bye Bye
A nice hunting support build, focused specifically on dealing massive amounts of damage to take those eidolons down fast. One suggestions of this build should be that you have Squad Energy Restore equipped to keep up the energy for your self and teammates, as we won't be killing many enemies here other than the eidolons.
Aura
We can interchange out our aura to fit in with the rest of the squad. We should be running either Corrosive Projection or Dead Eye.
Arcanes
Honestly it is up to preference here, we can run Arcane Guardian if you do not want to get killed as fast. Although Arcane Aegis will also have a substantial effect. Arcane Rage just continues to stack along with our Rubico Prime or Vectis Prime this could easily be interchanged with Arcane Momentum + Speed Trigger to achieve pretty much the exact same DPS / effect.
Primary Weapon (Sniper Rifle)
You will want to build your sniper rifle for high damage + crit damage. For example: Vital Sense + Critical Delay + Serration paired with any other status / multishot mods of your choice should do the trick.
Personally I use: Split Chamber + Hellfire + High Voltage + Vigilante Armaments + Stormbringer to really bump the damage up.
Focus
This is really up to the squad / you on how you want to run. With the new update to focus Madurai or Unairu can be very beneficial to the squad and yourself. If you enjoy using abilities and 'speed running' I'd recommend Madurai if you'd like to run this more heavily as a support role, I'd use Unairu. Again this can depend on your squad.