- For the fragments, see Fragments/The Tenets.
- For the Grineer counterpart, see Kuva (Variant).
- For the Infested counterpart, see Coda.
Tenet Weapons[]
Tenet weapons are a special variant of Corpus weapons carried by the Sisters of Parvos.
Ranged Tenet weapons are generated from a Candidate and are awarded upon defeating a Sisters of Parvos and choosing to Vanquish them, which will automatically appear in the Foundry. Claiming these weapons bypassing the supposed Mastery Rank requirement. The weapons vary in attributes, dependent on the Sister the player has slain. The Energy Color on the weapon is depicted by what elemental bonus was augmented on the weapon during Sister creation and the progenitor Warframe. All weapons have an equal chance of spawning from a Sister.
Tenet Arca Plasmor - Longer range before damage falloff occurs and shots ricochet off surfaces.
Tenet Flux Rifle - Enhanced fire rate and range, but uses clip magazine instead of an auto rechargeable battery.
Tenet Glaxion - Beam can chain to multiple enemies.
Tenet Tetra - Greater magazine; can eject its entire clip into a grenade.
Tenet Cycron - Beam can chain to multiple enemies.
Tenet Detron - Higher critical and status chance; can burst-fire its entire clip.
Tenet Plinx - Higher damage, critical chance, and status chance; can launch a projectile that pulls in enemies before exploding.Certain ranged Tenet weapons are unique to Sisters, and are not based on existing, usable Corpus weapons.
Tenet Envoy - Fires rockets that become laser-guided while aiming; auto-reloads when holstered.
Tenet Diplos - Akimbo automatic pistols that can engage a lock-on mode while aiming to burst-fire seeking projectiles; auto-reloads when holstered.
Tenet Spirex - Shoots projectiles with extreme speed; headshots speed up reloading.Melee and Speargun Tenet weapons are not obtained from Sisters, and the former are not based on existing, usable Corpus weapons. Instead, they can be bought from Ergo Glast of The Perrin Sequence in any Relay for 40 
Corrupted Holokeys each (regardless of standing with The Perrin Sequence syndicate). Unlike weapons directly acquired from Sisters, the Mastery Rank requirement is enforced on the store-bought weapons. Each offering has a random progenitor bonus damage type and percentage increase, which is cycled every 4 days at 0:00 UTC. Only one of each weapon can be bought per rotation.
Tenet Agendus (MR 14) - Hammer and shield whose heavy attacks launch energy disks.
Tenet Exec (MR 16) - Heavy blade with slam attacks unleashing multitudes of shockwaves.
Tenet Livia (MR 14) - Two-handed nikana that builds blocking angle from blocking; pauses combo duration when holstered.
Tenet Grigori (MR 14) - Two-handed scythe with heavy slide attacks releasing ricocheting energy disks; pauses combo duration when holstered.
Tenet Ferrox (MR 16) - Upgrades to critical, status, fire rate, magazine, and explosion radius at the expense of damage; holding down fire button immediately charges the next shot.
Mechanics[]
A Tenet variant of a weapon will only provide mastery points once. A second weapon of the same variant but with a different Sister name will not provide extra mastery. These weapons have a max rank of 40. To obtain the maximum rank, the player must polarize the weapon five times, with each Forma increasing the maximum possible rank by 2 (similar to 
Paracesis).
The Tenet weapons additionally have bonus damage of one damage type, ranging from 25-60% of the weapon's base damage determined randomly, with lower percentages being more common.[1] The damage type of this bonus damage is determined by the Progenitor Warframe, as per this table.
Note: This additional bonus damage applies as weapon base damage, meaning elemental mods and status that scale from base / modified base damage will be affected.
Valence Fusion[]
Valence Fusion combines two of the same Kuva or Tenet weapons into one with a higher Elemental Bonus, multiplying the highest bonus of the two weapons by 1.1, capping at 60% bonus. Valence Fusion can be found under the Actions button while modding a weapon. After selecting Valence Fusion, a player is required to choose another of the same Kuva/Tenet weapon from the inventory (not in Foundry or with the Kuva Lich / Sister of Parvos) to fuse it with. If the weapon's element bonuses differs, the player will be prompted to choose between the two available elements.
The final value of the Elemental Bonus after a Valence Fusion is performed is given by the formula:
And if the Final Bonus is equal or greater than 58%, the value gets rounded up to 60%.
Any other properties (Orokin Catalyst, Forma, Stance Forma, Exilus Weapon Adapter, or Focus Lens) do not transfer over, meaning the order of fusion is important. Put simply, it is best to equip the weapon with the most resource investment (weapon rank, Catalyst, Forma, and Exilus that you wanted to keep) and fuse other weapons to it.
After selecting the donor weapon to be used in the fusion, a confirmation screen displays the desired weapon's new damage type and bonus values and warns that the transfer will consume the selected donor weapon. Players are then prompted to type FUSE to confirm the fusion.
- Example:
Kuva Kohm (A) has 40% Heat Damage and an Orokin Catalyst. Kuva Kohm (B) has 52% Radiation damage. The player has two options, to fuse (A) with (B) or to fuse (B) with (A).
- Since 52% is higher than 40%, the result will always be according to the percentage of (B) and multiplied by 1.1, resulting in 57.2%.
- Fusing (B) to (A): Equip (A), under Valence Fusion, select (B). The result of this will be a Kuva Kohm with 57.2% Heat or Radiation damage with an Orokin Catalyst. (B) will be destroyed.
- Fusing (A) to (B): Equip (B), under Valence Fusion, select (A). The result of this will be a Kuva Kohm with 57.2% Heat or Radiation damage without an Orokin Catalyst. (A) will be destroyed.
For Weapons and same-tier Armaments, maximum % bonus (60%) can be achieved in the following number of fusions:
| Minimum Initial Value | Maximum Number of Fusions |
|---|---|
| 58.0% | 0 (automatically rounded up to 60.0%) |
| 52.8% | 1 |
| 48.0% | 2 |
| 43.6% | 3 |
| 39.7% | 4 |
| 36.1% | 5 |
| 32.8% | 6 |
| 29.8% | 7 |
| 27.1% | 8 |
| 25.0% | 9 |
For example, a Tenet Envoy with a 42% Toxin bonus will need at most 4 Fusions to reach the maximum element bonus of 60%.
Notes[]
- Unclaimed Tenet weapons in the Foundry can be sold directly for 10,000.
- Tenet weapons need to be Rank 40 in order to be Entitled, whereas Kuva Weapons can be Entitled at Rank 30.
- The total number of Tenet weapons is 15, requiring 75 Forma to max rank them all.
Trivia[]
- When sheathed, Tenet Envoy, Tenet Diplos, Tenet Grigori, and Tenet Livia fold up into an attaché case.
- Non-Tenet variants of the Tenet Agendus and Tenet Spirex, wielded by Juno Crewmen, Juno Combas, and Zercas, are exclusive to those enemies and not obtainable for players.