This is my Current [Lavos] build, It has preformed well in most endgame content (Haven’t brought him to level cap yet) and is able to deal with it all quite easily, Arcanes are entirely preference, I’m a big fan of Molt efficiency for the increased status duration and Molt Augmented to [Negate] the negative of [Overextended]

Helminth
I have found 6 Helminth abilities that work great with the game plan of using Catalyze as often as possible to apply corrosive and nuke;
Ensnare, Resonator, Larva, Coil Horizon, Pull, and Sickening Pulse
The first 5 are just to group and use Transmutation Drone and Ophidian [Bite] to reduce the Cooldown of Catalyze, the final helminth ability I recommend is Sickening Pulse with combined with Catalyze can nuke entire rooms with ease, I personally use Resonator as it draws fire from my Predasite and I while also grouping enemies that follow it

General Gameplan
1. Group enemies with your cc or by other means, you only need a one or two to nuke a whole room
2. Hold down 1st ability to infuse your next ability with Toxic (this will trigger [Archon Continuity] and apply Corrosive as well, applying two elements instead of just one if you were to infuse your next ability with Corrosive)
3. Prime Mecha [Marked Target] with a [Nukor] or other high status weapon (preferably with magnetic and Viral, More Status Types=More Damage)
4. Activate Catalyze, with just Toxic infused and no priming with a weapon Catalyze’s damage will be doubled 3 times for Heat, Toxic and Corrosive dealing major damage around you nuking entire rooms, with Priming with a magnetic [Kuva Nukor] (with Viral, radiation and Heat) I have seen numbers in the millions
5. Use Cc to group enemies and reduce cooldowns with Swift Bite and Transmutation Drone
6. Repeat

Predasite and Nukor Build
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Final Notes
This build was created by me but was based off a few builds I had seen on here, if you like seeing big numbers and are willing to put in the endo and credits, its an absolute blast to pilot, nothing like a nuking frame thats hard to kill