Nurgle is the Chaos God most directly involved with the plight of mortals, particularly Humans who suffer so acutely from a fear of death, perhaps the oldest fear of that species, or any other. While Nurgle is the god of death and decay, it is also the god of rebirth. When one becomes Nurgle's Chosen, His mark appears on the body as three circular lesions, typically weeping poisonous pus or infested with wriggling maggots. Despite this perceived displeasure, it is a blemish sought by and reserved for His most loyal servants. Nurgle grants his followers to ability to feel no pain. Though their bodies become infested, and you see their organs, they feel none of it.

 

Plagued being

At 3rd level you've become blessed by Nurgle and no longer suffer from exhaustion untill death, you are immune to disease, being poisoned and poison damage. You gain advantage on constitution saves. You cannot feel pain and you become a carrier for diseases, you automatically fail any save not to contract a disease.

Pulsing Flesh

At 3th level, your bodily frame has grown into your armor and given you access to new gifts of Nurgle, you double your number of hit dice you gain as you level and as a bonus action you can spend a number of hit dice to regain hit points.
Per hit dice spent you heal 10 + Constitution modifier hit points.

When you are reduced to 0 Hit Points but not killed outright, you can use this feature.

Rotting Growth

At 7th level you begin to surge with Vitality. When you are below maximum hit points, you gain temporary hit points equal to your fighter level + Constitution modifier + proficiency bonus at the start of your turn. You don’t gain this benefit if you have 0 hit points.

Gift of Pox Flesh

At 10th level, you've mutated more. You've been gifted the Pox Flesh. The pox flesh blessing makes it so that you reduce any damage you take by your proficiency bonus.

Bursting Hive Belly

At 15th level, you've grown a hive of insects inside you, as a bonus action you can spend a hit die to summon a Swarm of insects (Wasps). You have full control over the insects, the insects take their turn immediately after yours, if they occupy the same square as you or a friendly creature, enemies gain disadvantage on attacks against them and the insects.

You can only summon and control up to your constitution modifier of Swarm of Insects (Wasps).

Swarm of Insects (Wasps)

Blightlord status

At 18th level, with this you've grown more powerful as you have been gifted Nurgle's toughness granting you get a +4 to your constitution score and score maximum. your flesh has fused to your armor allowing you to add your Constitution modifier to the amount of damage you reduce from the "Gift of Pox Flesh" feature.