Poison

A poison is a substance that interferes with the natural functions of a living creature’s body, causing injury or death, typically requiring only a very small amount. Depending on the type of poison, a character may be able to resist or recover from poison with a successful saving throw. Poisons may be delayed or healed through the use of certain techniques or spells. Many different types of poison exist, each with unique effects.

Basic Poison
Basic poison deals 1d4 damage to the Poisoned creature at the beginning of each of their turns. Poisoned creature has disadvantage on all attack rolls. Basic poison lasts indefinitely (unless otherwise stated), but can be ended with a CON save (DC10 + poison's level (if unstated, it is poison level 0)).

Deadly Poison
Deadly poison, once applied to a creature, cannot be resisted or recovered from through a saving throw. A creature who has been poisoned with deadly poison takes damage at the end of each of their turns, starting with 1 and doubling with each subsequent turn (i.e. 1 on the first turn, 2 on the second, 4 on the third, 8 on the fourth, etc.). Further doses of deadly poison to the creature also doubles the damage to be dealt during the creature's next turn. Should the character drop unconscious while under the effects of deadly poison (i.e. HP has dropped to 0 or below), the creature has 1 further turn to rid themselves of the poison, or will die instantly upon the next instance of damage taken from deadly poison, regardless of their current HP, CON, or the next amount of damage to be dealt from the poison.

While deadly poison cannot be resisted or recovered through natural means via saving throws, it can be cured instantly with any healing technique, potion, or item (including evolution methods that restore health), in addition to usual poison curing items such as antidotes/anti-venoms. If any healing method is used, the creature inflicted with deadly poison is cured of the poison instead of recovering any HP.