Weapon Information
The Tenet Arca Plasmor is the Tenet variant of the [Arca Plasmor] with increased Base Damage, Critical Damage, Status Chance, better Linear Damage Falloff and decreased Fire Rate and Reload Speed with a Mastery Lock of 16.
The Tenet Arca Plasmor can be obtained by vanquishing a Sister of Parvos or by trading from a player a Sister they conquered.
The Tenet Arca Plasmor comes with 2 V Polarity Slots, making the builds in this guide require 3 Forma.
Tenet Element
The Tenet Arca Plasmor has the option of having a Bonus Tenet Element based off the Progenitor Warframe chosen when spawning a Sister of Parvos. For this guide I suggest Toxin, allowing the weapon to be strong against all factions, and allowing for flexibility. One may choose Magnetic to allow for Galvanized Savvy to deal more damage, but ultimately I think it is unnecessary.
Advantages
Disadvantages
Shots have travel time.
Has only a x1 headshot multiplier, no bonus multiplier.
Innate Punch Through doesn't apply to surfaces.
Corpus Build
Element Focus: Magnetic
Flex Slots: [Galvanized Savvy]

Grineer:
Element Focus: Corrosive or Viral/Slash procs
Flex Slots: [Toxic Barrage]

Infested & Deimos:
Element Focus: Blast or Viral/Heat Vs. Infested only
Flex Slots: [Galvanized Savvy]

Interestingly enough Blast does extremely well against both the Infested and Deimos with no issues. However, against the infested one can do Viral/Heat with switching out Galvanized Savvy with Toxic Barrage.
Orokin
Element Focus: Viral/Slash procs
Flex Slots: [Shotgun Elementalist]

Viral isn’t enough on its own to handle the Orokin in Steel Path, requiring Slash Procs to help.
The Murmur
Element Focus: Radiation
Flex Slots: [Galvanized Savvy]

Narmer Build
Element Focus: Viral/Heat
Flex Slots: [Blaze] or [Galvanized Savvy]

Viral/Heat outperforms Toxin only. However, another option is to run hunter munitions instead of blaze for slash procs instead.
Scaldra Build
Element Focus: Corrosive
Flex Slots: [Toxic Barrage]

Techrot Build
Element Focus: Gas
Flex Slots: [Toxic Barrage] or [Shotgun Elementalist]

Mod Slot Flex
Hell's Chamber - Flex out Galvanized Hell.
Primed Point Blank or Point Blank - Flex out Galvanized Savvy.
Chilling Grasp - Flex out Primed Chilling Grasp.
Charged Shell - Flex out Primed Charged Shell.
Ravage - Flex out Primed Ravage.
Blunderbuss - Flex out Critical Deceleration, only if one doesn't have Semi-Shotgun Cannonade.
Cleanse Mods - Flex out respective Primed counterparts.
Chilling Reload - Flex out Primed Chilling Grasp or Chilling Grasp.
Shotgun Barrage - Flex out Semi-Shotgun Cannonade.
Shrapnel Shot - Flex out build's Cleanse Faction Mod, if one doesn't like using Cleanse mods.
Tenet Arca Plasmor Enhancing
Damage Enhancement | [Rhino]'s Roar, [Nova]'s Molecular Prime, [Mirage]'s Eclipse, [Mesa]'s Shooting Gallery, Saryn's Toxic Lash, Equinox's Rage, Wisp's Haste Reservoir, Banshee's Sonar, Chroma's Vex Armor, Cyte-09's Resupply, Garuda's Passive.
Critical Enhancement | [Harrow]'s Covenant, [Volt]'s Electric Shield, Zephyr's Passive, Dagath's Grave Spirit, Gyre's Cathode Grace, Adarza Kavat with Cat's Eye, Smeeta Kavat with Charm.
Arcane Synergy
Arcane Acceleration - Warframe Arcane | Increases Fire Rate upon Critical Hits.
Arcane Avenger - Warframe Arcane | Increases Critical Chance upon being damaged.
Arcane Primary Charger - Warframe Arcane | Increases Primary Damage upon Melee Kill.
Arcane Arachne - Warframe Arcane | Increases Damage upon Wall Latching.
Riven Synergy
Ideal Positive Stats - Critical Chance, Critical Damage, Fire Rate
Ideal Negative Stats - Weapon Recoil, Status Duration only for builds that don't rely on tick damage.
Ending
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