Some rangers devote themselves to protecting society from the ravages of contagious disease and poisonous pollutants. Known as plague wardens, such rangers use their martial prowess to fight against disease-spreading monsters and those who would poison the world, augmenting their fighting with miasma absorbed from the air. They use their skills to cure those afflicted by toxins and brew poisons to wield against their enemies.

Plague Warden Magic

Starting at 3rd level, you learn an additional spell when you reach certain levels in this class, as shown in the Plague Warden Spells table. If the table lists multiple spells for a level, you choose only one of them to learn. The spell counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know. These spells can’t be replaced when you gain a level in this class, but instead you can change your decision for one level on the table.

Plague Warden Spells

Ranger Level	Spells
3rd	purify food and drink, spasm (new)
5th	lesser restoration
9th	plague vector (new), stinking cloud
13th	envenomed weapon (new)
17th	cloudkill, contagion

Level 17: Cloudkill

Choose cloudkill to know instead of contagion at 17th level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Level 17: Contagion

Choose contagion to know instead of cloudkill at 17th level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Level 3: Purify Food and Drink

Choose purify food and drink to know instead of the new spasm spell at 3rd level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Level 3: Spasm

Choose the new spasm spell (from The Impermissicon) to know instead of purify food and drink at 3rd level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Level 9: Plague Vector

Choose the new plague vector spell (from The Impermissicon) to know instead of stinking cloud at 9th level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Level 9: Stinking Cloud

Choose stinking cloud to know instead of the new plague vector spell at 9th level. It counts as a ranger spell for you, but it doesn't count against the number of ranger spells you can know.

Miasma Infusion

At 3rd level, you gain the ability to infuse your weapons and magic with noxious miasma. On your turn, when you hit a creature with a weapon attack or deal a creature poison damage or necrotic damage, you can cause the attack or effect to deal 1d6 bonus poison damage. If the creature is immune to poison damage, this feature adds 1d4 necrotic damage instead, or 1d6 necrotic damage if it is among your favored enemies. You cannot use this feature more than once per turn.

Plague Doctor

Also at 3rd level, you become preternaturally aware of the presence and nature of toxins. You gain proficiency in the Medicine skill, in herbalism kits, or in poisoner's kits (your choice). You can also cast detect poison and disease as a ranger spell without expending a spell slot or requiring components.

You can use this feature to cast the spell a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Toxin Tolerance

Starting at level 7, you gain resistance to poison and necrotic damage, and you have advantage on saving throws against poison or disease. You are also immune to the effects caused by any stench or bad smell, such as the stinking cloud spell.

Infectious Corruption

At 11th level, you learn how to spread miasma from foe to foe, increasing its power as it spreads. When you deal damage to a creature using your Miasmatic Infusion feature, you can also deal 1d8 poison damage to up to two other creatures of your choice within 15 feet of the target. If a creature is immune to poison damage, it takes 1d6 necrotic damage instead, or 1d8 necrotic damage if it is among your favored enemies.

Fuming Wounds

Starting at 15th level, your wounds and injuries give off noxious fumes that you direct. When a creature hits you with a melee attack, you can use your reaction to expose the attacker to these poisonous fumes. The attacker must succeed on a Constitution saving throw against your ranger spell save DC or become poisoned until the end of its next turn. If it can't be poisoned, its speed is reduced by 10 feet for the same duration instead.