Magnetic/Radiation/Viral/Electricity [Tenet Arca Plasmor]. Highest general utility without micro management. LONG

Do you want a shotgun that will blow up entire rooms of enemies in steel path and nuke single targets without worrying about enemy type?

Do you [Hate] swapping out mods before each mission and find you forget more than you remember?

This is the build for you.

A lot of morons recommend the kuva element toxin from a progenitor warframe like [Saryn] for [Tenet Arca Plasmor]. Let me assure you, these people are window licking knuckle draggers.

Yes, toxin allows you to get viral + radiation by just adding a cold mod, but then you are painted into a corner with [Galvanized Savvy]'s damage boost. Your choices are to add a second element mod that will just add more viral + radiation damage (and not a third element), or to add a different element mod that will combine with cold and remove viral, giving you toxin + something not viral + radiation.

You want MAGNETIC as your kuva element, not toxin. This gives you a base of radiation + magnetic with flexibility for your third and yes, FOURTH elements, for which you should go for Viral and Electricity. Magnetic also wipes out enemy shields, making your third element more flexible if it focuses on health (like Viral).

The result is a triple-double + single element boom stick that's got diversified damage types, nukes shields, shreds health, and confuses enemies if they somehow survive and are not one-shot.

But how do I get a magnetic Tenet Arca Plasmor, you ask?

Do this:
1) equip Harrow/[Harrow Prime] or one of the other magnetic progenitor warframes
2) equip [Xoris], go into "solo" mode
3) Go to Hydra on Pluto, and enter the golden hand using a [Zenith] Granum Crown
4) Use the Xoris's throw + heavy attack to blow up specters
5) Kill the sister of parvos, but don't X her, look at her first - it will show you what weapon she has equipped
6) If it's Tenet Arca Plasmor, use X to subdue her, if not, leave and repeat the mission until you get Tenet Arca Plasmor - making sure to kill the annoying guy to get your token back.
7) After subduing her, go back to "public mode", do all the star chart missions, figure out her requiems, and vanquish her to get your shiny new magnetic [Tenet Arca Plasmor].

You want [Galvanized Savvy] over Hunter Munitions unless you are doing level cap runs. The 35% chance for slash procs is outclassed by the extra condition overload-like damage of [Galvanized Savvy]. Slash procs take too much time to kill enemies, and your goal is to blow up rooms fast, not DOT them while you sip coffee and write a doctoral thesis on navel gazing.

For arcanes, you want primary merciless level 5. This not only causes your damage to grow as you blow up rooms in steel path, it gives you a 30% reload speed boost, allowing you to blast enemies without downtime.

This boom stick of death works with any warframe, but is particularly good with [Saryn] and [Wisp].

For [Saryn] her spores proc corrosive on everything, her toxic lash adds the toxic element that you will NOT be having on your Radiation/Magnetic/Viral/Electricity [Tenet Arca Plasmor] anyway. This means six (6) elements to stack with [Galvanized Savvy], stacking up to 2x each for a 40% damage boost each SOLO, in addition to any procs your teammates put on your helpless boom stick victims.

I highly recommend subsuming Gloom over Molt for your second ability - Gloom slows everything by 90% and heals you when you do damage. Then add Hunter Adrenaline to give you free energy when you are damaged. If you have a ton of extra energy and want to pre-proc viral, you can use Miasma.

For Wisp the haste from her motes greatly increases the fire rate of the boomstick. Since this is a one-shot build, this allows you to take down different areas of the map much more rapidly. This is my go-to primary build for Wisp. You can really stack up Primary Merciless with the crazy fire rate (although on my build I have a God-roll riven with Toxin in place of [Toxic Barrage]).

If you want to riven this build, you want to replace [Toxic Barrage] with the Riven. You'll want a combination of Toxin + any of Multishot, Crit Chance, Crit Damage, Fire Rate, or flat Damage + a harmless negative ideally.

This build absolutely shreds on steel path and has a fun factor of 11, especially with Saryn and Wisp (now both are available in prime).

Also consider this build variation that swaps Corrosive/Cold for Viral/Electricity depending on your setup: https://overframe.gg/build/430677/

Enjoy!