Update 35.5 (2024-03-27)

NEW WARFRAME AUGMENT MODS
11 new Warframe Augment Mods are available from Syndicate Offerings! 
Stats below are shown at Max Rank.
Recrystalize (Citrine - Crystallize)
Enemies killed by crystalline growths stagger and spread the crystals to enemies within 16m.
Available in the Red Veil and Steel Meridian offerings.
Update 35.0 (2023-12-13)

The crystal fractals on Citrine’s Crystallize will now disappear more quickly to reduce overall visual clutter. This does not impact the duration of the Crystalline Growths on foes -- we simply adjusted the ability effects where they search out foes.
Update 34.0 (2023-10-18)

Base vs Final Stats in Modding - Health / Energy / Shield / Armor Stat Overhaul
If you’ve spent any time invested in the deeper nuances of Modding, you may be familiar with “Warframe Math” - math that upon first glance doesn’t really make sense, but once you learn the inner workings of the game, it all comes together. While we can appreciate the value that complex systems offer to a certain subsect of players, there are other aspects of the game that should have clear and understandable outcomes. Namely: Shield, Health, Energy, and Armor Modding. 
Pop quiz: what is 300 + 440%? If you answered 740, you may just be an Excalibur player.
Vitality (+440% Heath), Redirection (+440% Shields), Flow (+150% Energy), and Steel Fiber (+110% Armor) come with large modifier values that don’t seem to match their outcome in-game. This is because these Mods apply their multiplier to the base stats of the Warframe - i.e., the stats you have at Rank 0. In the Excalibur example, a Rank 30 Excalibur’s Health stat of 300 earns an additional 440 Health from max rank Vitality (+440% Heath) since it applies to his base rank Health stat of 100, resulting in 740 total health.
In this update, we have removed this obfuscation by having Health, Shield, Energy, and Armor Mods apply to the stats of Warframes at their current rank. Continuing our Excalibur example, instead of Vitality always applying to Excalibur’s base rank 100 Health, it would apply to his Health stat based on his rank - namely, the stat you can actually see in your Arsenal. If your Excalibur were Rank 30, his Health stat would be 300, which means Vitality’s multiplier would be calculated off of 300.
With previous Health and Mod values, additional adjustments are needed to make this revision work while maintaining game balance. By only changing where the multiplier applies, a Rank 30 Excalibur would receive an extra 1,320 Health from max rank Vitality, resulting in a total health stat of 1,600. This outcome is a significant buff, which is not the intention of this system change. 
To remedy this, we approached this problem in two ways:
1 - We reduced the overall multiplier for Health, Shield, Energy, and Armor Mods.
Since these now affect Max Rank Warframe stats, these Mods need to scale differently to maintain the status quo. Additionally, we wanted these new values to be as clear and understandable to all players as possible! Here are a few examples of these value changes:

Vitality: Reduced from +440% to +100% Health
Redirection: Reduced from +440% to +100% Shield Capacity
Steel Fiber: Reduced from +110% to +100% Armor
Flow: Reduced from +150% to +100% Energy Max
Note: These are not all of the Mods affected by this change. We share the comprehensive list further down in this section of the update notes.
Doing some quick math, this means that a Rank 30 Excalibur (300 Health) with a reworked Vitality Mod (+100% Health, applied to the final Health stat) would receive 300 extra Health, for a total of 600. That, in contrast, is a nerf, which we also don’t want to do. 
So, our next step:
2 - We adjusted Warframe Health, Shield, Energy, and Armor values to keep the end result of the revised Mods as close to the original values as possible.
With this change, Excalibur’s Rank 30 Health stat is 370. With +100% Health from a max Vitality Mod, his resulting Health stat would be 740, which matches what it was originally. 
While this path to the same result may seem a little complicated, the outcome matches our intention: we want players to be able to look at their Health, Shield, and Armor Mods, and be able to understand how they affect the stats they see in their Arsenal.
In addition to everything above, we also increased the base stat values for Warframes so that these revised Mods offer similar value for lower-ranked Frames. To do so, we reduced the amount of Health/Shield/Energy that Warframes earn per rank in half, and transferred the sum of that value to their base stats.
For Armor, this is the one stat that does not increase with your Warframe’s level (with some exceptions). Armor values across the board have been slightly increased to compensate for the Mod changes.
Not to beat a dead Kaithe, but Mods will now be applying to the Max Rank stat instead of the Base Rank. You may look at these numbers and think “nerf” or “buff” depending, but the outcome is that total Modded values are the same, if not a little higher in some cases.
Warframe Stat Changes:
CITRINE
Health: Base Rank - 400 (from 135) / Max Rank - 500 (from 405)
Shields: Base Rank - 270 (from 100) / Max Rank - 370 (from 300)
Armor: Base Rank - 265 (from 250)
Energy: Base Rank - 130 (from 120) / Max Rank - 180 (from 180)
While there may be significant changes to Warframe Stats and Mod values as a part of this overhaul, the end result is that your Builds should mostly stay the same. The key difference is the added clarity of what your Health / Shield / Energy / Armor Mods do in your Upgrade screens!
Update 33.0 (2023-04-26)

Fixed Citrine’s Fractured Blast not affecting ragdolled enemies.
Hotfix 32.3.6 (2023-03-15)

Made slight changes to Citrine’s noble animation set FX timing. Also adjusted left arm movement.
Fixed Citrine’s Prismatic Gem disappearing when she enters a Nullifier bubble.
This is consistent with other Warframe abilities such as Chroma’s Effigy, where his pelt remains active outside of the bubble regardless of if Chroma enters it.
Fixed Citrine Specters not using abilities.
Hotfix 32.3.5 (2023-02-28)

Increased the number of enemies Citrine’s Prismatic Gem can attack per second from 1 to 2.5.
Fixed several leg armor attachment issues with Citrine. More fixes to come!
Hotfix 32.3.4 (2023-02-23)

Fractured Blast can now hit breakable environment items (crates, barrels, etc.).
Made adjustments to the sound mixing for Citrine’s abilities.
Fixed the crystals from Citrine’s Crystalize ability on enemies (especially non-humanoid enemies like Chargers and Ospreys) having unreliable hit detection when hit, which made it difficult to trigger its bonus Critical Damage.
Fixed Citrine’s Crystalize bonus Critical Damage not triggering when hitting its crystal formations with the Convectrix.
Fixed being unable to chat-link Citrine’s Component Blueprints.
Added acquisition help text to Citrine’ Blueprint descriptions in the in-game Market.
Hotfix 32.3.3 (2023-02-17)

Fixed more Syandanas having issues when equipped by Citrine.
This should be the last of these fixes!
Hotfix 32.3.2 (2023-02-16)

Added Ability videos to Citrine in the Arsenal.
Hotfix 32.3.1 (2023-02-15)

Increased the travel speed of Citrine’s Crystallize fractals.
Updated the sound mixing for Citrine’s Crystallize ability.
Fixed clipping issues for Citrine on many pieces of Leg Armor.
Fixed positioning issues for Citrine with many Syandanas.
Update 32.3 (2023-02-15)

Introduced.