The Shadowfang Mantle, a legendary fur cloak, is a blessed artifact bestowed upon mortals as a token of favor from the mighty Fenrir, the fearsome wolf of Norse mythology. Crafted from the dark and primal essence of Fenrir's own fur, this mantle grants the wearer unparalleled strength, agility, and a touch of the beast within.

Properties:

Ferocious Protection: While wearing the Shadowfang Mantle, you gain a +2 bonus to your Armor Class, reflecting the impenetrable fur and the enchanted essence of Fenrir. Additionally, you have advantage on Dexterity saving throws.

Fangs of Fenrir: Once per turn, when you successfully hit a creature with a melee weapon attack, the target must make a DC 18 Strength saving throw or be knocked prone as the ferocity of Fenrir's power surges through you.

Aspect of the Beast: As a bonus action, you can tap into the primal nature of Fenrir, assuming a beastly aspect. Your size becomes Large, and your speed increases by 10 feet. Your melee weapon attacks deal an additional 2d6 slashing damage, representing the savage strength of Fenrir's jaws. This transformation lasts for 1 minute or until you end it as a bonus action. Once you use this ability, you cannot use it again until you finish a long rest.

Moonlit Shadows: The Shadowfang Mantle grants you the ability to blend seamlessly with the shadows. You have advantage on Dexterity (Stealth) checks made to hide or move silently. Additionally, you gain darkvision with a range of 120 feet.

Fangs Unleashed: Once per long rest, as an action, you can summon the full power of Fenrir's wrath. A spectral image of Fenrir's jaws appears around you, enveloping a 20-foot radius. Each creature within this area must make a DC 18 Dexterity saving throw, taking 10d8 piercing damage on a failed save, or half as much damage on a successful one. Additionally, a creature that fails the saving throw is also restrained by the spectral jaws until the start of your next turn. After using this ability, the Shadowfang Mantle loses its magical properties until the next dawn.

Beast Within: The Shadowfang Mantle resonates with the wild instincts of Fenrir, enhancing your natural abilities. You gain advantage on Strength checks and saving throws. Additionally, you have resistance to nonmagical bludgeoning, piercing, and slashing damage.

Flavor Text: "The Shadowfang Mantle, a sacred gift from the great wolf Fenrir, emanates the raw power of the beast. Adorned with the enchanted fur of the primal wolf, it grants its wearer unparalleled protection and unleashes the fury of the wild. The blessed mantle channels the essence of Fenrir, the embodiment of untamed strength and unyielding ferocity, empowering those who dare to don its dark embrace."

Notes: Bonus: Armor Class, Advantage: Dexterity Saving Throws, Advantage: Stealth, Sense: Darkvision, Advantage: Strength Ability Checks, Advantage: Strength Saving Throws, Resistance: Bludgeoning, Piercing, and Slashing from Nonmagical Attacks, Control, Buff, Movement, Warding, Outerwear