A pair of items. If it's not obvious, I subscribe to the "dark, scary" magic school of thought.
Ring of Ice
A ring crafted from unmelting, but decidedly cold, ice. You cannot perform any task requiring fine finger dexterity with the hand it's worn on as the cold spreads from your finger, over your hand, up your arm, and can soon enough even be felt in your heart, though only your hand goes numb and shivering. While wearing it, however, you face no danger from extreme temperatures - in fact, you don't even feel them; only the chill of the ring.
When you focus on the chill of the ring filling your veins to the exclusion of all else, roll+CON. ✴On a 10+, choose one or two. ✴On a 7-9, choose one.
• The chill of the ring spreads out from you, coating everything in a thin layer of frost and extinguishing light sources.
• One creature or object you stare at is encased in ice.
• Ice runs through your veins and your body hardens. Gain +1 armor ongoing until you rest.
• The ice slows your bodily functions and nourishes you. The next time you would mark off a ration, don't. You don't need to sleep tonight.
A long and wicked iron nail. When you drive it through your hand, though the wound sears and throbs in pain and drips blood steadily, it causes no actual harm and is healed as soon as the nail is withdrawn. In addition, the shed blood burns like oil in the light of the moon.
While the nail is buried in your flesh you are immune to mind-affecting enchantments and can see through illusions and glamours.