J - Jewel of Pain

Magical gem, looking like glowing fire opal, with very simple effects:

• If used as part of jewelry, such as rings, diadems or necklaces, wearer of such item must save vs. magic each time when he / she is hit in combat. If save is failed, received damage is doubled.
• If used to decorate a melee weapon, makes that weapon magical. Every living being (not robots, undead or elementals) hit by this weapon must make successful save vs. magic or damage is doubled.
• If used as a part of magical wand, staff and other spell-casting device, it explodes during first attempt of using the item. Explosion has radius of 3 meters and deals 1-12 damage.