It is needed for the Dumplingsruneword which, when in effect, causes any food consumed to regenerate 400% more vitality (100% before Patch 4.0). Unlike other runestones, it must be crafted and cannot be obtained in any other way.
This runestone has no effect when placed in an upgrade slot, and raises the weapon's level requirement by 1.
In the crafting menu, this runestone's weight is listed as 0.01 when it is actually 0.03.
Trivia[]
This runestone references the Eastern European dish pierogi, which are filled dumplings created with unleavened dough and prepared either by boiling or baking.