Sigil of Health
From Krakiipedia, the unofficial free GemStone IV encyclopedia.
"This is the Sigil of Health, memorize it well. Previously, you were taught how to attune your body to the natural healing devices of Elanthia. However, nature can be a slow beast, especially in the heat of battle. When you find yourself in need of an immediate transfusion of blood, this sigil may well save your life. By focusing on this sigil, you can condense your slow natural recovery into a single moment in time. You will thus be able to instantly recover either half of your lost hit points or 15 of them, which ever is greater. The cost of this power is 20 points of stamina and 10 points of mana. Go now, and make good use of what I have taught you."
- Restores 50% of your missing health, or 15 hitpoints, whichever is greater
Note: Thanks goes to Belnia for all the information provided by her research.