This [Nidus] build focuses a lot around endgame survivability and damage.

Originally I had thought of using [Insatiable] over [Adaptation] for the additional mutation stacks, however I believe [Adaptation] is much more useful in this scenario. You won't need to generate that large number of stacks if you don't die.

Stacking early revolves around taking damage for energy using [Hunter Adrenaline] then using the combination of larva and virulence.

If you choose to use an Umbral mod you will be able to have all mods at max rank.