Dungeons & Dragons 5e Element 133 Class Feature: Rare Reaction

When producing Essences and you roll a natural 20 on your Alchemy check the produced Essences have extraordinary potency. The rolls of potions produced with these essences have their damage and healing rolls always with their maximum results. If the produced potion has no damage or healing roll you produce double the amount of that potion.

In addition, You gain expertise with the Alchemist's Supplies. Now your Alchemy Check is (DEX + INT + your proficiency modifier) x 2.