Tvarog runestone is a runestone in the Hearts of Stone expansion. One is needed to create the Dumplingsruneword which, when in effect, causes any food consumed to regenerate 100% more vitality (i.e. doubling the amount of health regenerated).
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.
Bugs
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.