In the ever-shifting arsenal of Warframe, few additions have left as strong an impression as the Tenet weapons introduced alongside the Sister of Parvos update. Though Digital Extremes has continued to expand the game in the years since, this Corpus Lich-style system remains a defining source of high-end armaments for players in 2026. The update added not only the aquatic Warframe Yareli but also a new way to claim personalized, high-powered variants of classic Corpus technology.

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What Are Tenet Weapons?

Tenet weapons are a special variant of existing Corpus weapons in Warframe that are carried by a Sister. Each weapon is essentially a Parvos Granum-approved upgrade, bestowed with additional power and unique characteristics. A Tenet variant grants mastery points only once; obtaining another weapon of the same variant but with a different Lich or Sister name does not provide extra mastery. This encourages players to farm efficiently and avoid unnecessary duplicates.

Every Tenet weapon also offers bonus damage of one damage type. The exact attributes vary depending on the Sister the player has slain. Additionally, the Energy Color of each weapon is determined by the elemental bonus that was augmented during Sister creation, which is tied to the progenitor Warframe selected by the player. This system adds a layer of customization and buildcraft, allowing players to influence the elemental nature of their new weapon.

How to Get Tenet Weapons

Players can obtain Tenet weapons only by defeating the Sister who is carrying them. Unlike many other weapons in Warframe, these variants bypass the usual Mastery Rank requirement when claimed from the Foundry, provided the player has enough weapon slots. This makes them accessible as long as a player is able to complete the Sister hunt.

All Tenet weapons have an equal chance of spawning from a Sister, so there is no weighted rarity among the available pool. Players hunting for a specific weapon will need to cycle through Sisters until the desired variant appears.

The first three Tenet weapons—Tenet Envoy, Tenet Diplos, and Tenet Spirex—are unique to Sisters and are not based on existing Corpus weapons. The remaining five are reengineered versions of familiar Corpus armaments.

All Eight Sister-Dropped Tenet Weapons

The Sister of Parvos update introduced a total of eight Tenet weapons that can be obtained from Sisters. They are divided into unique weapons, primary variants, and secondary variants.

Weapon Type Description
Tenet Envoy Unique Launcher A wire-guided rocket launcher that travels slowly but delivers greater accuracy. The patented Granum Attaché System reloads the weapon when holstered.
Tenet Diplos Unique Secondary A pair of auto-lock-on, homing-projectile pistols. Shooting from the hip offers a more conventional pistol experience. The Granum Attaché System reloads the pistols when holstered.
Tenet Spirex Unique Secondary A pistol that dominates rivals with lightning-fast rail-slugs. Scoring headshots speeds up the reload process.
Tenet Tetra Primary Variant The Parvosian upgrade of the classic Tetra. It has a slower fire rate but comes with a larger magazine. Alt-fire launches the entire clip as a large burst-radius grenade.
Tenet Flux Rifle Primary Variant A modified Flux Rifle with increased fire rate and range. Recharge has been replaced with ammo clips to accommodate greater power needs.
Tenet Arca Plasmor Primary Variant A custom variant of a Corpus classic. Staggering blasts now ricochet and have greater range at the cost of slower fire and reload speed. Surviving enemies are consumed with radiation.
Tenet Cycron Secondary Variant A reengineered Cycron with a refracting energy disc that can split off the main target and hit up to two additional nearby targets.
Tenet Detron Secondary Variant An already ferocious hand cannon made more destructive with an alternate fire mode that empties an entire clip in one devastating burst.

Tenet Melee Weapons

In addition to the eight Sister-dropped firearms, there are four melee Tenet weapons in Warframe that cannot be obtained from Sisters. These are:

  • Tenet Exec

  • Tenet Grigori

  • Tenet Agendus

  • Tenet Livia

These Tenet Melee weapons can be purchased from Ergo Glast in any Relay for 40 Corrupted Holokeys each. Because they are not tied to the Sister system, players can acquire them directly without hunting a specific Sister, making them a more deterministic reward for those who have accumulated the required currency.

The Tenet weapon system remains an engaging loop in 2026. Whether players are chasing a specific elemental bonus, optimizing a primary or secondary loadout, or working toward the four melee options, the Sister of Parvos update continues to provide meaningful long-term goals. The combination of unique Sister weapons, upgraded Corpus classics, and melee rewards from Ergo Glast offers a broad range of playstyle options, from explosive area control to precise headshot-focused sidearms.