You can create poison from your touch and venom from your fangs. These methods do a mixture of different abilities depending on how you apply them. You can have one of each Venom or Poison contained or applied at a time. Venoms and Poisons created last for 10 minutes or until delivered afterwich follow the duration as described below if not instantaneous. You have a save DC equal to 10 + Constitution Modifier + Proficiency. Any item that grants a bonus to your class save DC adds to this save DC.

Delivery

Snake Bite.

You have a natural weapon that deals 1d4 piercing and has finesse. This counts as a Simple weapon. You can deliver your Venom directly when you hit with this bite.

Venom Extraction.

As an action you can extract the venom in your fangs and collect it to become a vial. A vial can be used to coat a melee weapon delivering the venom or 10 pieces of ammunition. 

Poison Swab.

As an item interaction you can excrete poison from your skin. Collecting it with a swab or directly applying it. A swab can be used on the edge of a melee weapon or tip of a piece of ammunition. Alternatively when an enemy grapples you, you can use a reaction to excrete a poison against that target.

Blood Letting.

As a replacement for a melee attack with a piercing weapon you can stab yourself (no attack no damage) and let acid flow to be collected into a flask or immediately released with you at the center. A flask can be used as a thrown weapon or used as part of an explosion when hit by an attack.

Venoms

Regardless of delivery method. The target or targets make a save against your save DC. Then follow instructions on a failure or success. The venom if it has an effect, it lasts 1 minute.

Serum.

Wisdom Save. On a failure the targets become charmed by you. They make a constitution save at the end of each turns to remove the charmed condition.

Sedative.

Constitution Save. On a failure the targets become unconscious. Any addition damage or an action used will grant them an additional save to wake up.

Vicious.

Strength Save. On a failure the targets take 20d6 poison damage. Half on a successful save.

Poisons

Regardless of delivery method. The target or targets make a save against your save DC. Then follow instructions on a failure or success. The poison if it has an effect, it lasts 1 minute.

Cytotoxins.

Constitution Save. On a failure the creature feels pain, if the creature has a protection against death it triggers as if they had died and your future points are immune to the same kind of ability that was triggered for 24 hours. If the target is not protected they make an additional constitution save at the end of their turn or die (only removing this poison can save the target from death. On a successful the target is immune to this poison for 3 rounds.

Neurotoxins.

Dexterity save. On a failure the targets become paralyzed. They can make a constitution save at the end of each of its turns to remove the paralyzed condition.

Hemotoxins.

Heals 20d6 hit points.

Acids

Acids alter the delivery method. The acid if it has an effect, it lasts 1 minute.

Hydrochloric.

Gas in an area 50 ft radius. Dealing additional 10d6 acid damage if the poison or venom does damage and the creatures effect can’t regain hit points until the start of your next turn.

Sulfuric.

Splashes a 20 ft radius adds 30 healing if the poison or venom does healing (including healing from absorption).

Fluorosulfuric.

A burst of antimagic in a 120ft radius against targets of your choice. This begins suppressing some magic items and slowing spell casting. Unattended Magic items each roll a 1d12 on a roll below its tier the item is suppressed for 1 min. Creatures with the spellcasting ability makes an intelligence save at the start of their turn on a failure they cannot cast spells on a success this effect ends for them. Effected creatures must roll a 1d12 when activating a magic item. On a roll below its tier the item does not activate and is suppressed for 1 min.

Admixture

You can Combine your Poisons, Venoms, and Acids and how you mix them determines special properties. 

Venom + Poison.

When these two mix as part of application to a weapon they share saves (the initial save one of your choice and using Constitution save if any follow on saves.)

Venom + Acid.

You can bite yourself to activate both the venom and the acid. They use the Venom’s save but is delivered how its described by the acid.

Poison + Acid.

You can drop the poison into the flask to mix the two. They use the Poison’s save but is delivered how its described by the acid.