Tips

1. You will need an explosive primary weapon such as [Acceltra] or [Kuva Zarr](for hitting enemies in 4th)
   2.Secondary weapon is at your pick but faction weapons such as [Rakta Ballistica] might be more useful for radial proc.
   3.Melee is optional
   4.Cast his 1st when you need cc and to monopolize an area(work really well against nullifiers as it may turn that area in an anti-nullifier zone for 6 to 12 seconds)
   5.Cast his 2nd to escape tough situations(you will be immune to damage while in wave, make as much use of that)
   6.By using pillage instead of his puddle [Hydroid] becomes more useful and engaging, as such you will need an active playstyle.(also the beauty of pillage is that it does better than 2 of [Hydroid] arguments +it gives overshields)
   7.Using the argument for his 4th is somewhat mandatory.
   8.Instead of waiting for his 4th to end, recast it as soon as u see more enemies coming or if the fight moves somewhere else.
   9.[Natural Talent] is highly recommended for speeding up his slow animations.
   10.[Primed Continuity] is somewhat necessary (I consider 28% duration to be perfect for his 2nd and 3rd)
   11.Zenurik is also recommended for consistent ability casting and energy recovery for quick thinking
   12.Since I am an Volt main I made a build that works for my playstyle, feel free to add and/or switch things up to fit your needs.I created this build through trial and error in steel path missions, but ultimately you decide what works best for your [Hydroid].
   Best of luck⚡