Be in the same clan, without leaving it, for 1 real life year (4 Alyrian years). Deposit a root in order to receive the mark once the appropriate amount of time has passed.
You hand The master of clans a tiny amount of maleficarum roots. For thy stolid participation in your clan, the Powers have granted thee a Mark. You have gained the Mark of Stone! You gain 500 archon points! You gain 100 practices!