Way of Miasma

Miasma based 

Miasma Shroud

Starting at 6th level, you can envelope yourself in a shroud of miasmic energy. As a bonus action you can spend a ki point to activate you Miasma Shroud, which lasts for 1 minute or until you dismiss it as a bonus action. While your Miasma Shroud is active you gain the following benefits:

- your movement speed is increased by 10ft

- When you take damage from a melee attack, you can use your reaction to release a burst of miasmic energy in retaliation and the creature that damaged you is momentarily surrounded by the energy. The creature must make a CON saving throw (DC 8 = your proficiency bonus + WIS modifier). The creature takes 2d10 poison damage on a failed save and half as much damage on a success one. Once you use this feature, you cant use it again until you finish a short or long rest.

Miasmic Techniques

At 3rd level, you gain a deep understanding of the miasma's properties and how to harness them in combat. You can spend 1 ki point to channel the miasma's essence into your unarmed strikes. Each strike deals 1d6 poison damage on a hit for the rest of the turn. This features damage die increases to 1d8 at level 11

Additionally, creatures hit by your attacks must make a CON saving throw (DC8 = your proficiency bonus + your WIS modifier) or become poisoned. The creature can repeat the saving throw at the end of their turn to end the effect on a success.

Miasmic Adaptation

Beginning at 11th level,  your exposure to the miasma has granted you adaption to the harsh conditions of the miasmic wastes. You gain the following benefits:

- you have advantage on saving throws against environmental hazards such as extreme heat, extreme cold or toxic gasses.

-As a bonus action you can spend 2 ki points to channel the miasmas energy into a 10ft radius sphere centred on yourself. This area becomes dense and oppressive to any creature hostile to you. Until the start of your next turn creatures hostile towards you who are in the area have disadvantage on attack rolls and saving throws. Once you use this feature you cant use it again until you finish a short or long rest.

Miasmic Mastery

At 17th level, you have mastered the art of manipulating miasmic energy. When you use your 'Miasmic techniques' feature, you can spend ki points to increase the poison damage. For each additional ki point spent, the damage increases by 1d6.

Additionally, your 'Miasmic form' last until you dismiss it as a bonus action and you can use it twice before a long rest.