This powerful glyph seems to have been imprinted into the skin and bone of the recipient, it's powers flow from the place of origin through the entire body. It's power is constant and ever moving, a river that changes its course every turn. Installed by Malphas, The Herald of Time and servant of the Wheel, this mark proclaims that time itself has claimed whoever wears it.
When you finish a long rest, roll a d20 and record the number rolled. You or the DM can replace any attack roll, saving throw, or ability check made by you with this foretelling roll. However, if the roll is above 10, The player can use it; if the roll is below 10 the DM can use it; the roll of 10 can be used by either party. You or The DM must choose to do so before the roll, and you can replace a roll in this way only once per turn. Such a foretelling roll can be used only once. When you finish a long rest, you lose any unused foretelling rolls.
The glyph is situated on top of Kosa's right hand. Prior attempts to learn about it have revealed that it probably contains a kind of divination magic within it to spy on the bearer, and that when the bearers dies its soul is forefeit to Malphas.