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

Furthermore, Gems can be ground to extract Black Powder.


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