The Warframe is the cheap part
Everyone talks about Helminth in terms of the frame you sacrifice. That is the visible cost and the one that stings emotionally, but it is not the binding constraint. The binding constraint is secretions, and secretions have a mechanic that punishes the obvious strategy.
The Helminth eats resources and converts them into six secretion types: Bile, Biotics, Calx, Oxides, Pheromones and Synthetics. Each has its own 100 percent cap. Every Helminth function spends them.
The trap is preference. The Helminth starts out liking everything. Feeding it a resource lowers its preference for that resource. A preferred resource converts up to 30 percent; a disliked one converts as little as 3 percent.
That is a tenfold swing driven entirely by your own feeding history. Dumping 500 of your most abundant resource is the single worst way to feed it, because the first batch is efficient, the tenth is nearly worthless, and you have burned a resource you will need later for something that actually matters.
| State | Conversion rate |
|---|---|
| Preferred | up to 30% |
| Neutral | baseline |
| Disliked | as low as 3% |
| Special resources (Lucent Teroglobe, Pustulite, Ganglion) | up to 60% |
Three resources are worth feeding specifically because they always give double: Lucent Teroglobe converts to Calx, Pustulite to Biotics, and Ganglion to Biotics, all at up to 60 percent. If you are short on Biotics, those are the feed of choice.
The practical rule: rotate what you feed. Feed a resource until its arrow turns down, then switch. That keeps every conversion near the top of the range instead of grinding one resource into worthlessness.
What subsuming actually costs you, and what it gives back
Subsuming consumes a built non-Prime, non-Umbra Warframe permanently. Any level works, though level it to 30 first for the mastery. The frame disappears and you free a Warframe slot, which is worth 20 platinum.
So the real cost of a subsume is: one frame’s build cost, minus 20 platinum of slot value, plus 23 hours of waiting. The wait can be rushed for 50 platinum, which is more than the slot is worth, so rushing is rarely correct unless you are chaining several subsume operations.
Rules that catch people:
- Only one frame can be subsumed at a time.
- The same frame cannot be subsumed twice, so a second copy of a frame you already subsumed is just a frame.
- Passives are not subsumable. Only the designated ability.
- The Helminth must be at Metamorphosis Rank 1 before it can subsume anything.
- You must type CONFIRM. The game is not being cute; this is unrecoverable.
The infusion slot rule is the real planning constraint
Once an ability is subsumed, it can replace one ability on any Warframe, including Prime and Umbra variants. Each frame can replace one ability per mod configuration, and different configs can carry different abilities.
Here is the constraint nobody mentions until it bites: a particular ability always occupies the same ability slot across every config it is infused into.
A Volt with Decoy infused over Speed cannot infuse Decoy over Shock on another config. To have Decoy on two different slots you need two copies of Volt. To move it, you remove and re-infuse, paying the full secretion cost again.
That means the decision you are actually making is not “which ability do I want” but “which slot am I willing to give up, permanently, on this frame”. For most frames there is exactly one ability nobody uses, and if you pick wrong, undoing it costs secretions you may not have.
Replacements are reversible in the sense that you can swap abilities, but the secretions spent are not returned. There is no refund path.
Ability replacement and damage buff restrictions
Some damage buffs cannot stack with each other, so a frame that already has a native damage buff will not benefit from infusing a second one. Check whether the frame’s own kit already does what the ability you want would do before spending the secretions.
This matters most for the popular picks. A frame with its own multiplicative damage buff gains little from another, while a frame with none gains enormously. The same ability can be transformative on one frame and a wasted slot on another, and the difference is entirely in the native kit.
Invigoration, and its randomised price
Invigoration grants a temporary buff to a Warframe available that week. Each one costs two different secretion types, and each cost is randomised between 20 percent and 90 percent.
A worst-case invigoration therefore consumes 180 percent of secretions across two types — nearly two full secretion bars for a temporary buff. Budget for the average rather than the best case, and do not invigorate a frame you are not about to play.
What the Helminth also does
Beyond infusion, it carries the Archon Shard system: implanting, removing and fusing shards. Removing a shard costs a colour-specific resource rather than a flat fee, which the Archon shards guide covers in detail.
It also holds the Helminth Charger, a companion created from the cyst, which is one of the seven companion classes.
The order to build it
- Get the segment. 15,000 Entrati standing at MR8, or 300 platinum. Standing is cheaper if you have the rank; platinum is faster if you do not.
- Subsume a frame whose ability you actually want, not the frame you like least. The ability is the product; the frame is packaging.
- Feed in rotation so no single resource collapses to 3 percent.
- Pick the slot carefully on the receiving frame, because the choice is sticky across configs.
- Only then chase Invigoration, which is a temporary buff and the last priority in the system.
For frames worth the investment, the warframes tier list groups them by job. For the mod layer the infused ability has to fit into, the mods guide covers capacity and polarity. Mastery Rank matters here because the segment requires MR8, and arbitrations are where a well-infused frame earns its keep.