Failed Magic Items: Dungeon Master's Guide Part 10 (M)

Even Xanathar himself might think twice about cataloging these.

Greetings! Will here with another Failed Magic Items article. This time, the "M" items!

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Mace of Disruptions
Weapon (mace), rare

This sentient mace speaks in a very loud and annoying voice at the most inopportune times. While you are wielding it in combat, you must make a DC 10 Wisdom saving throw before every attack roll. On a failure, the mace disrupts your train of thought with a loud and often trivial interjection, which then imposes disadvantage on the attack.

Mace of Biting
Weapon (mace), rare

This mace sports a sharp-toothed mouth on its head that constantly opens and closes with terrifying speed. Upon stowing this weapon, the mace sinks its teeth into the closest body part it can find, dealing 2d6 Piercing damage. Using an action, you can make a DC 10 Strength check to pry its jaws open and free yourself from it. Failing this check will cause it to clamp down harder, dealing an additional 1d6 Piercing damage and raising the check's DC by 1.

Additionally, a successful attack made with this weapon deals an additional 2d6 Piercing damage and exposes the target to the above effect.

Mace of Terriers
Weapon (mace), rare (requires attunement)

This magic weapon has 3 charges. While holding it, you can use an action and expend 1 charge to release a terrier from its confines. The animal is very cute and friendly but is otherwise useless in most situations.

The mace regains 1d3 expended charges daily at dawn.

Mantle of Spell Vulnerability
"Wondrous" item, rare

You have disadvantage on saving throws against spells while you wear this cloak.

Manual of Bodily Harm

"Wondrous" item, very rare

This book contains ill-advised health and diet "tips", and its words are charged with magic. The moment you open this book, the information contained within floods into your mind and your Constitution score decreases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century. This effect can be counteracted by reading the Manual of Bodily Health.

Manual of Gainful Eating
"Wondrous" item, very rare

This book describes ways to eat more food more quickly without regard to your personal health, and its words are charged with magic. The moment you open this book, the information contained within floods into your mind and your Strength score decreases by 2, as does your maximum for that score. Additionally, your speed decreases by 5 feet and your weight increases by 50 pounds. The manual then loses its magic, but regains it in a century. This effect can be counteracted by reading the Manual of Gainful Exercise.

Manual of "Golems"
"Wondrous" item, very rare

This tome contains information and incantations necessary to make a golem. However, the manual is very poorly written, possibly by someone who is ignorant of its subject matter, and upon spending a day and 1,000gp, you create a horrific amalgamation of stone, steel and flesh that could technically be considered a golem, but is too poorly constructed to be of any use. The book is then consumed in eldritch flames.

The "golem" cannot speak but its eyes constantly beg for death, any attempt to "fix" it only results in further failure, and you receive a -5 penalty to Charisma ability checks until you put the poor thing out of its misery.

Manual of Slowness and Inaction
"Wondrous" item, very rare

This book contains all the best tips for being lazy and procrastinating, and its words are charged with magic. The moment you open this book, the information contained within floods into your mind and your Dexterity score decreases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century. This effect can be counteracted by reading the Manual of Quickness of Action.

Medallion of Subconscious Thoughts
"Wondrous" item, uncommon (requires attunement)

The medallion has 3 charges. While wearing it, you can use an action and expend 1 charge to cast the Detect Thoughts spell (save DC 13) from it. However this particular use of the spell only allows you to detect the target's most perverse subconscious thoughts and upon hearing them you must make a DC 13 Charisma saving throw. Upon a failure you take 2d4 Psychic damage.

The medallion regains 1d3 expended charges daily at dawn.

Mirror of Life Sapping
"Wondrous" item, very rare

This alluring silver mirror is near-flawless in its construction and appearance. Upon gazing at it you must make a DC 20 Wisdom saving throw. If you succeed, you are immune to the mirror's effects for 1d4 days. Upon a failure, you are unable to look away as it slowly deals 2d6 Necrotic damage to you every minute. You may repeat this saving throw at beginning of each of these minutes. Additionally, the damage taken decreases your maximum HP by the same amount until your next long rest. If the mirror drops your HP to zero, you instantly die and your soul is trapped in the mirror, making resurrection impossible.

A Remove Curse spell can release your soul from the mirror.

Myth Armor
Armor (medium or heavy, but not hide), uncommon

You are the only one who believes this armor exists. Any attempt to convince others of its existence is met with failure and sometimes you even doubt it yourself.

It imparts no benefits or effects aside from the lively debate it sometimes inspires.

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All for now, thanks for reading!