Crimson Toxflower

Poison Creator. As the Crimson Toxflower is used to poison that it itself produces it is immune to poison damage and conditions.

Toxic Gas. As an action, the Crimson Toxflower releases a cloud of poisonous gas in a 20 ft radius. Each character in range must make a DC 15 CON save. On a failure, the character takes 3d6 poison damage and has the condition poisoned. Then the character takes 2d6 poison damage the next turn, and so on until the damage reaches 0. After all the damage has taken effect, the character is no longer poisoned or under the poisoned condition. On a success, the character takes half damage and is not poisoned. The gas remains for two turns, and every turn a character is in the radius of the gas, they must make the DC 15 CON save again. This action can be taken every two turns.

Agile Decomposer. Whenever a character in a 15 ft radius dies, the Crimson Toxflower will use a bonus action to decompose the character. After the Toxflower uses this bonus action for three turns, the body will have decomposed. The Toxflower regains full health and half the creatures max hit points and temporary hit points.