Way of the Violet Adder

Talona's chosen agents carry out her will with deadly efficiency. Monks of her sacred order train their bodies to resist the effects of poisons and diseases as not to fall prey to their own weapons. The mortals of this realm WILL fall, and the last gasping breaths will curse the name of Talona's Adders.

Adder's Fang

When you choose this tradition at 3rd level, you grow a set of fangs that fill with venom. Your bite is a natural weapon which you can use to make a Martial Arts attack. If you hit with it, you deal piercing damage equal to you Martial Arts damage die plus either your Strength or Dexterity Modifier. Once per round, when you make a successful bite attack, the creature you attacked must make a Constitution Saving throw (DC=8+Prof+Wis) or become Poisoned for one minute. An enemy that succeeds this saving throw is immune to this effect for the next 24 hours. You must declare that an attack is a bite before making the roll.

You also gain proficiency with Poisoner's Kits.

Tears of Talona

You are adept at surprising your foes mid-strike. At 6th level, you can spend 2 ki points immediately after taking the attack action on your turn to cast the burning hands spell as a bonus action. The damage dealt by this spell is either poison or acid, chosen before casting.

You can spend additional ki points to cast burning hands as a higher level spell. Each additional ki point you spend increases the spells level by 1. The maximum number of ki points (2 plus any additional points) that you can spend on the spell equals half of your monk level.

Patient Zero

At 11th level your biology changes even further, and you are capable of deadlier feats of biological warfare. You gain immunity to acid damage and the ability to spend 6 ki points to cast the spell contagion as an action ignoring the verbal, somatic, and material components. The saving throw DC for this spell is 8+Prof+Wis.

Blessing of the Plague Mistress

The blessing of Talona can be a curse to the unenlightened. At 17th level you can designate a creature within 60ft of you to make a Constitution Saving Throw (DC=8+Prof+Wis). Creatures that fail this saving throw gain Vulnerability to acid and poison damage as well as Disadvantage on saving throws to resist disease effects. Creatures that succeed this saving throw are unaffected and immune to its effect for 1 hour. You may use this feature a number of times a day equal to your Wisdom Modifier.