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's name references quark (Polish: twaróg), a dairy product popular in much of continental Europe. It is often translated to English as "curd cheese" or "cottage cheese" which is often viewed as a specific type of quark.