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Item Description

An important tool in component processing. It has stable properties, and will never explode, powderize, or crack.

Item Usage

A grindstone used to process weapon parts. Can be used for a variety of upgrades and for production in the Factory.

Best Farming Areas

Operation Sanity per Drop Fast/Value?
4-8 61 Value
3-3 46 Fast

Operations Item Drops From

Common Drop

Stage Type Mission Sanity Drop Rate Sanity per Drop
Activity GT-6r 15
Activity GT-6 15
Activity TW-8 18
Activity AF-8 18
Main 3-3 15 32.61% 46.0
Main 4-8 21 34.71% 60.5
Main 5-7 21 34.60% 60.7
Main 6-14 18
Main 7-17 21

Additional Drop

Stage Type Mission Sanity Drop Rate Sanity per Drop
Main 3-8 18
Main 4-5 18
Main 4-8 21
Main 4-9 21
Main 5-4 18
Main 5-8 18
Main 6-2 18
Main 6-4 18
Main 6-10 18
Main 6-15 18
Main 7-2 18
Main 7-5 18
Main 7-9 21
Main 7-10 18
Main 7-14 18
Main R8-3 18
Main R8-9 18
Main R8-10 18
Main JT8-2 21
Sub S4-2 18
Sub S4-5 18
Sub S4-8 18
Sub S5-7 18
Main S6-1 18
Main S6-4 18