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Rotproof Rockgrain
The Rotproof Rockgrain is an ingredient in the Reclamation Algorithm game mode of Arknights, introduced in Tales Within the Sand's Expansion II.
Tiny white cubes commonly used by the locals to preserve food. According to stories, if you find a boulder in Arsalan and gently tap its side facing away from the sun, a tiny avalanche of these will fall off.
Usage[edit]
A saline substance used by the people of Szubat-Arsalan as a highly effective preservative additive, Rotproof Rockgrain is one of the additional ingredients for Provisions which extends its effect duration by a whopping 20 days and is worth 5 Energy when used to make 
Energy Drink.
How to obtain[edit]
The Rotproof Rockgrain can only be obtained by defeating a Rogue Burdenbeast which yields 2 Rockgrains and in the Feral Strange Territory either as zone drops or rewards.