Grinding is a crafting skill which uses a single ingredient and grinds it in a stone mortar and pestle to create ingredients for cooking or other trades. You do not need any tools to grind ingredients, just hitting 'L' by default is enough.

Grinding: Beginner

For more advanced grinding, you need to learn the knowledge Grinding: Beginner from Ornella in Heidel City by completing her quest Materials for Equipment Repair. The quest is a part of Learning Higher Processing Skills, which can be obtained in two ways: Have Gathering Apprentice 4 and get the quest directly from Ficy in Heidel City, or complete the questline started by the Black Spirit as you enter Heidel City.
The Black Spirit will ask you to go to Jemkas Wyrmbane, who will have the quest Because I Like You, which requires you to either have Gathering Beginner 7 or have completed the quest Go to the Northern Heidel Quarry.
Complete the rest of the questline to get access to Learning Higher Processing Skills and Ornella's quest:

Grinding: Skilled


Product Created Ingredient #1 Ingredient #2 Skill Required
Mystical Spirit Powder icon Mystical Spirit Powder Either of these:
1x Guardian Spirit Stone (Green)
1x Guardian Spirit Stone (Blue)
1x Destruction Spirit Stone (Green)
1x Destruction Spirit Stone (Blue)
1x Life Spirit Stone (Green)
1x Life Spirit Stone (Blue)
Processing Beginner 1[1]
Chicken Feed 20x Rough Stone 100x Barley [2]
Black Stone (Armor) icon 1-3 Black Stone (Armor) 2x Hard Black Crystal Shard Processing Beginner 1[3]
Black Stone (Weapon) icon 1-3 Black Stone (Weapon) 2x Sharp Black Crystal Shard Processing Beginner 1[4]
Enhanced Flax Fabric icon Enhanced Flax Fabric 5x Flax Fabric 5x Shining Powder Grinding: Skilled[5]
Polished Stone icon Polished Stone 10x Rough Stone Processing Beginner 1[6]
Wool icon Wool 10x Knitting Yarn Grinding: Beginner[7]
Silk icon Silk 10x Silk Thread Grinding: Beginner[8]
Flax fabric icon Flax Fabric 10x Flax Thread Grinding: Beginner[9]
Cotton Fabric Icon Cotton Fabric 10x Cotton Thread Grinding: Beginner[10]
Insectivore Plant Sap icon Insectivore Plant Sap 5x Insectivore Plant Stalk
or 5x Insectivore Plant Root
Processing Beginner 1[11]
Insectivore Plant Powder Icon Insectivore Plant Powder 5x Insectivore Plant Flower
or 5x Insectivore Plant Leaf
Processing Beginner 1[12]
Resplendent Lapis Lazuli Icon Resplendent Lapis Lazuli 5x Rough Lapis Lazuli
or 5x Lapis Lazuli
Grinding: Beginner[13]
Lapis Lazuli Icon Lapis Lazuli 5x Rough Lapis Lazuli Processing Beginner 1[14]
Resplendent Diamond Icon Resplendent Diamond 5x Rough Diamond
or 5x Diamond
Grinding: Beginner[15]
Diamond Icon Diamond 5x Rough Diamond Processing Beginner 1[16]
Resplendent Emerald Icon Resplendent Emerald 5x Rough Emerald
or 5x Emerald
Grinding: Beginner[17]
Emerald Icon Emerald 5x Rough Emerald Processing Beginner 1[18]
Resplendent Topaz Icon Resplendent Topaz 5x Rough Topaz
or 5x Topaz
Grinding: Beginner[19]
Topaz Icon Topaz 5x Rough Topaz Processing Beginner 1[20]
Resplendent Sapphire Icon Resplendent Sapphire 5x Rough Sapphire
or 5x Sapphire
Grinding: Beginner[21]
Sapphire Icon Sapphire 5x Rough Sapphire Processing Beginner 1[22]
Resplendent Ruby Icon Resplendent Ruby 5x Rough Ruby
or 5x Ruby
Grinding: Beginner[23]
Ruby Icon Ruby 5x Rough Ruby Processing Beginner 1[24]
Freekeh Flour Icon Freekeh Flour 1x Freekeh
or 1x High-Quality Freekeh
or 1x Special Freekeh
Processing Beginner 1[25]
Teff Flour Icon Teff Flour 1x Teff
or 1x High-Quality Teff
or 1x Special Teff
Processing Beginner 1[26]
Top-Quality Cooking Honey Icon Top-Quality Cooking Honey 3x Wild Beehive Processing Beginner 1[27]
High-Quality Cooking Honey Icon High-Quality Cooking Honey 3x Wild Beehive Processing Beginner 1[28]
Cooking Honey Icon Cooking Honey 3x Wild Beehive Processing Beginner 1[29]
Corn Flour Icon Corn Flour 1x Corn
or 1x High-Quality Corn
or 1x Special Corn
Processing Beginner 1[30]
Sweet Potato Flour Icon Sweet Potato Flour 1x Sweet Potato
or 1x High-Quality Sweet Potato
or 1x Special Sweet Potato
Processing Beginner 1[31]
Potato flour icon Potato Flour 1x Potato
or 1x High-Quality Potato
or 1x Special Potato
Processing Beginner 1[32]
Barley Flour Icon Barley Flour 1x Barley
or 1x High-Quality Barley
or 1x Special Barley
Processing Beginner 1[33]
Wheat Flour Icon Wheat Flour 1x Wheat
or 1x High-Quality Wheat
or 1x Special Wheat
Processing Beginner 1[34]

Furthermore, Gems can be ground to extract Black Powder.


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