From Izanagi Online Wiki

Gathering is extracting resources used for Recipes (Cooking), Pneuma Quests & Mid Ninja Exam

Gathering experience is incresed by extracting resources from extract spots at fields and rises Gather level (GEXP)

Every Gather level gives one Skill point for Gathering to increse sucessfull extraction from spots.

There is ten (10) types of resources for extract. Nine of them are used for regular Recipes and one for Mid-Ninja Exam (Gathering & Crafting).