A reworked version of my [Nidus] build, centered far more around Survivability and Dishing out insane Damage.
Ðis build is designed to be used wiþ my [Cleansing Parasite], [Bile Spitter], [Festering Maggot Maker] and [Tearing Cartilage] builds. Alternatively you can use my [Stretching Claws] build!

Playstyle:
Find a comfortable spot and unleash your inner Infested self, gain Maggots, eat Maggots, gaðer Enemies, and destroy ðem wiþ your Beautiful, Squirming Flesh. When you find you are being worn down by ðe Endless Onslaught, find an unsuspecting Enemy to Leech off, pull out your [Tearing Cartilage] and become a True Festering Demigod.

Aura:
[Growing Power] gives more Ability Strengþ up to 232%, allowing our abilities to do more ðan enough Damage to keep Enemies down, well into ðe later hours of Endurance runs. If using [Stretching Claws], I would recommend using Swift Momentum, as it boosts Heavy Attack Wind-Up Speed, as well as Combo Duration. Anoðer decent option, if you see yourself using ðe [Cleansing Parasite] often is [Rifle Amp] for more Damage output, or [Pistol Amp] if you like using [Bile Spitter] more!

Exilus:
[Power Drift], gives yet more Ability Strengþ for reason listed above.

Mod Explanations:
[Primed Continuity], increases Ability Duration by a significant amount, allowing our Infested field, [Nidus]' 4, to last a very long time, keeping us Healing and Hunkered sown for plenty of time,
[Umbral Vitality], [Umbral Fiber], and [Umbral Intensify] give +180% Healþ, +180% Armour, and +77% Ability Strengþ Respectively, taking [Nidus]' EHP value up to 10,000, (if you are feeling cheap and using base [Vitality], [Steel Fiber] and [Archon Intensify], it is only 5,850 EHP and +60% Ability Strengþ) as well as allowing him to slaughter lesser Infested wiþ ease,
[Strain Consume] is a part of ðe Strain mod set, which I have put on for simple fun factor, if you want practicality, put on [Stretch] for more Ability Range, and leave one slot wiþ a Naramon Forma,
[Adaptation] gives yet more Survivability via 90% DR at max stacks, very useful if going a long time in a Survival, or a Defense,
[Abundant Mutation] allows us to go to 300 stacks of Mutation, extremely powerful as you can go up to 148,694 Damage per cast of his 1 per enemy hit at max stacks and maximum Ability Strengþ, enough to kill a SP Level Cap Infested Crawlers, Runners, and Chargers in 2 hits, or a SP Level Cap Ancient Healer in 7 or 8, absolutely insane Damage, ðe only downside is ðe 30 second cooldown on undying, which can be a huge issue if you don't keep Enemies off you well enough in later levels,
[Hunter Adrenaline] has amazing synergy wiþ [Nidus], as he has only Healþ to be damaged, meaning every hit against him gives energy.

Arcanes:
Arcane [Guardian] gives yet more Armour on hit 90% of ðe time, truly huge boosts to Survivability, taking our [Nidus] up to 16,000 EHP, (9750 on budget build) and when combined wiþ Arcane Reaper we go up to 20,000 EHP, (12,600 on budget build) not including [Adaptation] or Linking to an Enemy wiþ our 3, or using an Ancient Healer Specter, each supplying an extra, fully stacking, 90% DR. You can also use Arcane Avenger or Arcane [Rage] in place of one of ðe above for more Damage output from your Rifle! I personally would swap Arcane Reaper for Arcane [Rage] if you can hit lots of Headshots, but as Infested Enemies tend to be harder to aim Headshots for, maybe Arcane Avenger is a better choice...

Now you are ready to fight fire wiþ fire and kill all Infested who dare stand in your way, good luck,

Festering Demigod.