Artifact: Robe of Blue Flames

This elegant garment is made from exquisite cloth of fiery red, adorned with golden runes. The robe's color changes to a pale grey if anyone other than the owner adorns it and saps away at their hp by 3d20 per round... You can't attune to The Robe of Blue Flames unless it chooses you as it's owner, with whom it bonds with until they die. You gain these benefits while wearing the robe:

• If you aren't wearing armor, your base Armor Class is 13 + your Dexterity modifier.
• You have advantage on saving throws against third level spells and below as well as minor magical effects.
• Your spell save DC and spell attack bonus each increase by 2.
• You take half damage from any fire attribute spells or attacks.
• When channeling the power of the blue flame, 3 times per long rest you can change any fire damage to cold damage

Notes: Set: Unarmored Armor Class, Advantage: Saving Throws, Bonus: Spell Attacks, Bonus: Spell Save DC, Restrained, Druid or Sorcerer , Buff, Warding, Outerwear