Originally Posted by Wutan

The only efficent way to farm Life Crystals is to run Event Maps. Preferable the 80 Stamina Maps. How many Life Crystals drop from those Maps is different in each Event though.

You can't get Dressblooms from the Life Crystal Shop only Skillblooms. That means you can only get Skill Levels not Equipment Slots.

Second this. Also, if you just want to farm life crystals, wait for the second half of the event and grind the final map there (?-8) instead as you'll get an extra crystal per run compared to the last map of the first half (?-4).