| abstract
| - The Infestation dwelling within Nidus mutates rapidly when used against his foes, fueling his abilities and yielding various symbiotic benefits. Nidus possesses various passive mechanics highlighted in the tabs below: |-|Mutation Stacks = Mutation is a resource unique to Nidus, indicated by its counter and gauge displayed in the lower-right on the HUD, above the ability icons.
* The gauge is divided into five sections which represent the number of hits dealt to enemies via Nidus' abilities. The counter at the center of the gauge keeps track of the number of Mutation stacks.
* Upon hitting one or more enemies via Virulence or Ravenous, depending on the number of hits the sections of the gauge will light up clockwise. After a total of 5 hits, the gauge finishes a complete cycle and the sections become unlit again, while the counter increases by 1 Mutation stack.
* Abilities are not required to deal damage to enemies, only scoring hits is needed to increase Mutation stacks.
* Mutation stacks are stored until used by the player. Stacks will not disappear in the event of a host migration.
* Ability-nullifying enemies such as Nullifier Crewman will drain 1 Mutation stack every 2 seconds, ramping up the drain rate the longer Nidus remains in their radius.
* Up to a maximum of 100 stacks can be stored. Each stack causes the gauge to gradually appear more infested. Upon reaching 100 stacks, the counter is hidden and the gauge is overlapped by Virulence's ability icon colored in red and black.
* Parasitic Link costs 1 stack to activate instead of using energy.
* Ravenous costs 3 stacks to activate instead of using energy.
* Nidus' appearance changes as more stacks are collected:
* At 3 stacks, tendrils will protrude from his neck and upper spine, while the carapace around his ribs will open.
* At 5 and 7 stacks respectively, the carapace around his thighs and arms will open to reveal more infested flesh and tendrils beneath.
* At 10 stacks, certain sections of his currently-equipped helmet will open up, and many more tendrils will be exposed.
* When stacks fall below the required triggers, Nidus' appearance will revert to the appropriate stage. |-| Undying = If Nidus suffers fatal damage with at least 15 stacks of Mutation, those 15 stacks are consumed, granting him 5 seconds of invulnerability and restoring health to 50%.
* A UI banner displaying "Undying" and an invulnerability timer will appear at the top-center of the screen while this passive is activated. The required amount of Mutation stacks will be visibly subtracted from the counter and gauge.
* If Nidus has less than 15 Mutation stacks, all stacks will be consumed without benefit if he is incapacitated or killed. |-|Rank Bonuses = Nidus gains the following additional bonus stats while leveling up, alongside regular statistic increases for his health and power pools, indicated at the top-left of the Warframe Upgrade page:
* +10% / +20% / +30% / +40% / +50% Armor (at ranks 3 / 9 / 15 / 21 / 27, respectively)
* 5 / 7 / 9 / 11 / 13 Health regen per second (at ranks 1 / 7 / 13 / 19 / 25, respectively)
* +3% / +6% / +9% / +12% / +15% Ability Strength (at ranks 4 / 10 / 16 / 22 / 28, respectively)
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![[RDF Data]](/fct/images/sw-rdf-blue.png)