Decay Domain

The Decay Domain embodies the great constant in the universe, the certainty that all things shall eventually come to an end. The Clerics of Decay sacred protectors of this holy process.

Ward Against Rot

Starting when you choose this domain at 1st level, you can use your action to touch a willing creature other than yourself to give it resistance to poison or necrotic damage (your choice). This resistance ends after 1 hour, after the creature has taken any amount of poison or necrotic damage, or if you use this feature again.

Hasten Demise

Also at 1st level, you can hasten the demise of the wounded. As a reaction, when a creature you can see within 120 feet of you fails a saving throw to avoid taking damage from a spell of 1st level or higher, you can use your reaction to immediately deal damage to the creature equal to your Wisdom modifier (a minimum of 1 damage). The damage type is poison or necrotic (your choice).

You can use this feature a number of times equal to your Wisdom modifier (a minimum of once). You regain all expended uses when you finish a long rest. 

Channel Divinity: Inflict Blight

Starting at 2nd level, you can use your Channel Divinity to poison and fatigue your enemies .

As an action, you present your holy symbol and evoke festering energy. All creatures of your choice within 30 feet of you must succeed a Constitution saving throw or be poisoned. A creature poisoned in this way takes poison damage at the start of each of its turns equal to half your cleric level. A creature can repeat the saving throw at the end of its turn, ending the effect on itself on a success.

Improved Demise

Beginning at 6th level, you can use your Hasten Demise feature to also affect a creature that succeeds a saving throw to avoid taking damage from a spell. The spell must be of 1st level or higher.

In addition, the damage the creature takes from your Hasten Demise feature increases by 1d4.

Strengthened Decay

Beginning at 8th level, your magic wounds your enemies more effectively. Whenever you cast a spell that deals poison or necrotic damage, you gain a bonus to one of the damage rolls of the spell equal to your Wisdom modifier.

Avatar of Decay

Starting at 17th level, you gain resistance to poison and necrotic damage.

In addition, poison and necrotic damage dealt by your spells ignores resistance.