Elemental Gem
Wondrous item, common (requires attunement)
Whether natural or manmade, this 1-inch jewel has absorbed elemental magicks and can transfer its power to a weapon or piece of armour. By holding the gem to your chosen item for 10 minutes, it seamlessly integrates itself into the item. Attaching the gem to a weapon causes it to deal 1d6 bonus damage of its element, while attaching it to armour or jewellery grants resistance to damage of its element.