The Plaguebearer

You made a deal with the Plaguebearer, a dark god-like being that wishes to spread pestilence across the world . 

The Plaguebearer will do anything to complete their goal, even if it means indoctrinating a weak adventurer to do their bidding. 

Plagued Heal

At 1st level, At 1st level, whenever you kill a creature, heal 1d4 health. 

Increase health healed by 1d4 at levels 7, 14 and 20. 

Plaguefire

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Starting at 1st level, you may use this as a reaction when a creature attacks you with a melee attack. You deal 1d8 poison damage to the attacker. 

Disease Resistant

Starting at 6th level, you are resistant to poison damage, and have advantage against being poisoned

Plaguebearer’s Resilience

At 10th level, gain immunity to poison damage, and can’t be poisoned. 

Whenever a creature attempts to affect you with a condition, even if you are immune to it, inflict the creature with poisoned. 

Poisoned Cloud

Starting at 14th level, you can use an action to trap an enemy in a poisonous cloud, causing it to take 5d8+2 poison damage for 1d4 turns. If the creatures is attacked by another creature’s physical attack, they take an additional 1d8 poison damage. This ignores resistances to poison damage. 

Once you use this feature, you can’t use it again until you finish a long rest.