Have five flasks of at least Magic rarity and 20% quality equipped, including at least one with an enchantment.
Glassblower’s Bauble improves the quality of a flask.
Quality Increase 1 by Rarity: Normal(5%), Magic(2%), Unique(1%).
Note: Apply 20% quality to a normal flask before upgrading it to a magic flask.
Orb of Transmutation upgrades a normal flask to a magic flask.
Flasks can only be normal, magic or unique. There are no rare flasks, and flasks cannot be corrupted.