Arknights Wiki
Advertisement

Grindstone Pentahydrate is an upgrade material in Arknights.

Description

An advanced grindstone used in the finish machining of weapon parts. Can be used for a variety of upgrades and the synthesis of D32 Steel.

Compared to normal Grindstone, this tool has an even more stable structure. It is highly non-reactive.

Usage

The second of the Grindstone-type upgrade materials, Grindstone Pentahydrate is similar but much more stable and non-reactive, thus making it more useful and essential for Operator skill Mastery training and the Elite 2 promotion of 5★ and 6★ Operators.

Due to its stability, the Grindstone Pentahydrate is an important material for the synthesis of D32 Steel.

Acquisition

Store

Grindstone Pentahydrates are available in:

  • Distinctions Store (sometimes) for 10 Distinction Certificate icon.png.
  • Headhunting Parametric Model Store for 75 Headhunting Parametric Model icon.png.

Special drops

Operation Sanity Drop rate
21 Sanity icon.png
Very Rare
 (~5%)
21 Sanity icon.png
Very Rare
 (~5%)

Workshop

Product Material(s) LMD Morale Requires
Grindstone Pentahydrate.png
1
Grindstone.png
1
 
Oriron Cluster.png
1
 
Integrated Device.png
1
300 LMD icon.png Morale icon.png Level 3 Workshop

Trivia

  • Pentahydrate is a suffix used for chemical compounds with five water molecules bound to it.

See also

Advertisement