A thoroughly invulnerable and maggot-y boy. The goal? Produce at least 3 Mutation Stacks per second, thereby becoming invulnerable due to your passive, Undying.
Also the goal; Produce an exceptional amount of maggots per second.

Paired Melee build: Pathocyst - Straining Credulity | Maggots, Maggots Everywhere
Paired Companion build: Helminth Charger - Straining Credulity | Maggots, Maggots Everywhere

How-to/general gameplay loop:

• Cast Virulence(your 1) on groups of enemies to generate Mutation Stacks and generate energy for each enemy hit.

• Cast Larva(your 2) to group enemies for Virulence.

• After building Mutation Stacks, cast Parasitic Link(your 3) on a nearby enemy or ally to double the damage of Virulence and the number of Mutation Stacks produced. Where possible, keep Parasitic Link active on an enemy or ally.

• After building Mutation Stacks, cast Ravenous(your 4), preferably in a good chokepoint. This will heal you and allies, produce maggots(yay!), and cause you to gain approximately 60% more Mutation Stacks.
  • Hold-to-cast Virulence to target maggots on enemies or in groups of enemies for additional Mutation Stacks.

• Use R⁠olling Guard(tap shift) when in danger(Radiation status, about to cast Ravenous, below 15 Mutation Stacks, after Undying's 5 seconds of invulnerability wear off) to become invulnerable, then use that invulnerability to gain additional Mutation Stacks.

Why this choice/other options:

• S⁠train Consume - Allows for maximum maggots. Can be replaced with a number of mods with additional Forma, including S⁠treamline, S⁠tretch, A⁠ugur Secrets and Primed C⁠ontinuity.
  • Do not replace this with Abundant Mutation - the Undying cooldown will kill you in high-level content.

• R⁠olling Guard - A core element of the build. Allows you to avoid damage completely, if well-timed, and should scale better than A⁠daptation in extremely high-level content.

• I⁠nsatiable - The other core element of the build. Makes Mutation Stack generation much, much faster, allowing you to easily chain Undying into Undying for survivability.

• S⁠teel Charge - Swap to taste. Can be swapped for Growing Power with an additional Forma, or, with an Aura Forma and an additional Forma, for an aura of your choice.

• Primed F⁠low - Virulence can generate more energy than it cost to cast, which Primed F⁠low allows you to take full advantage of. Having a large energy pool also makes missed Virulence and Larva casts less punishing - with Primed F⁠low(45% Efficiency, 531 Maximum Energy), Virulence and Larva's costs are 11.7% and 7.3% of your energy pool, while with S⁠treamline instead(75% Efficiency, 188 Maximum Energy) they're 26.6% and 16.6% of your energy pool, which is clearly worse - you have to r⁠each at least 150% Efficiency for S⁠treamline to outperform Primed F⁠low for N⁠idus Prime.

• Arcanes - Arcane Energize makes it easier to keep up your energy with 45% Efficiency, while Molt Augmented is great for endurance runs, which this build shines on. Swap to taste.

Tips and Tricks:

• Equip [Amalgam Barrel Diffusion] on your Secondary to slightly increase the usable invulnerability time from R⁠olling Guard and slightly decrease the range your rolls send you.