Crafting

14 potion recipes at the Alchemists, 30 gem upgrades at the Gem Specialists and 7 Health Potion upgrades at the Priests.

Recipes

The 14 potions the Alchemists craft at no gold cost, and their ingredients.

The Gem Specialists turn 10 gems of one tier into 1 of the next, for gold.

The Priests upgrade the Health Potion one tier at a time, for gold and plants.