These artifacts/relics of immense power grant power and ability to their wielder, often numerous powers/abilities. Some objects are sentient, or have an inherent intelligence and will of their own, and are capable of taking possession of those who claim and use them; either mentally or by full body possession. The conditions of possession, if applicable, vary from the wielder being in grave danger, or when s/he is angered or enraged. Sentient artifacts/objects can speak through their host when they take full control over the host's body and mind. Most items are accompanied by Powers Via Object.
Tessaiga (Inuyasha), Inuyasha's traditional weapon.
The Hōgyoku (Bleach) can manifest a person's greatest desires, granting them unimaginable powers.
Devil Fruits (One Piece) grant the eater special powers, at the cost of the user being rendered permanently unable to swim.
The Death Note (Death Note)
The Dragon Balls (Dragon Ball series)
The planet sized Super Dragon Balls (Dragon Ball Super), which can summon the Dragon of the Gods.
The Potara (Dragon Ball series) can not only fuse any two beings together, but the resulting fusion will have the full, maximum potential of the two multiplied tenfold, resulting in a being of incomparable power.
The Cyber Planet Keys (Transformers: Cybertron)
The Skyboom Shield (Transformers: Armada). Strongest defensive force in the universe. Capable of withstanding the Star saber and the Requiem Blaster
The Star Saber (Transformers Armada) is one of the three most powerful weapons in the known galaxy. Not only does it posses incredible cutting power, but its Mini-Con power enhancing technology allows it to increase the strength and combat prowess of any Cybertronian who wields it, allowing them to battle on par with better skilled soldiers.
The Requiem Blaster (Transformer: Amarda) is the most powerful energy weapon in the galaxy. Being able to draw power from celestial bodies, the weapon can harness the power of a supernova and unleash it with the intense gravity of a black hole.
The Millennium Items (Yu-Gi-Oh)
The Clow Cards (Cardcaptor Sakura)
ÄRMs (Marchen Awakens Romance)
The Legendary Silver Crystal (Sailor Moon) can revive entire world and all of its inhabitants from ruin.
The Power Sneakers (Sonic the Hedgehog), Sonic's iconic footwear, help reduce friction on Sonic's feet to allow him to run at his full potential.
Chaos Crystals (Sonic Boom)
The Master Sword (Legend of Zelda)
Mysterio standing before the Tablet of Order and Chaos (Spider-Man: Shattered Dimensions)
Super Mushroom (Mario)
1-UP Mushroom (Mario)
Mega Mushroom (Mario)
The Blades of Chaos (God of War)
The Blades of Exile (God of War)
Heart Container (Legend of Zelda)
The Star Rod (Mario/Kirby)
The Keyblade] (Kingdom Hearts)
The Apple of Eden (Assassins Creed)
The Swords of Sparda (Devil May Cry)
The Magic Armor (The Legend of Zelda: The Wind Waker) grants an invincible defense.
The Magic Armor (The Legend of Zelda: Twilight Princess) makes the wearer invincible.
The Phantom Sword (Legend of Zelda: Phantom Hourglass) was forged by protectors of the Ocean King with the power to destroy phantoms as well as slow down time.
The Lokomo Sword (Legend of Zelda: Spirit Tracks' is infused with sacred energy that is capable of stunning phantoms.
Samus Aran's Power Suit (Metroid)
The Soul Edge (Soul Calibur)
The Soul Calibur (Soul Calibur)
The Soul Reaver (Legacy of Kain)
The sacred golden power of the gods, The Triforce. (Legend of Zelda series)
The Vampire Killer (Castlevania), the Belmont clan's legendary whip, is able to harm any vampiric or demonic entity, even divine beings such as Death himself.
The Precursor Stone (Jak and Daxter)
The Mantra Reactor (Asura's Wrath)
The Wailing Dark (Asura's Wrath) is Augus' favored weapon. It is capable of deliver energy slashes, slicing part of the moon, and even extending to miles that seem endless.
The Dragon Sword] (Ninja Gaiden) is Ryu Hayabusa's signature weapon.
The Dragon Blade (Naruto Shippūden: Dragon Blade Chronicles).
Mega Stone and Key Stone (Pokemon)
Z-Ring and Z-Crystal (Pokemon)
Clank holding the Chronoscepter (Ratchet & Clank)
The Paintbrush. (Epic Mickey)
Ocarina of Time (Legend of Zelda: Ocarina of Time)
The Power Stones (Power Stone series) are legendary stones of mysterious power that are said to make dreams come true. When three are collected, the collector is able to access a Power Change to become a more powerful version of himself/herself
In the Power Stone anime, there are seven Power Stones, each able to grant its bearer incredible power. When the seven stones are united, they are able to create the Light Stone and bring about an age of miracles and wonder.
Lucille (Channel Awesome), also known as the "Hammer of Power", is an ancient artifact disguised as a regular claw-hammer that grants those who are worthy the powers and title of the Blockbuster Buster.
Linkara's Magic Gun (Channel Awesome) is a toy gun that is imbued with powerful magics. Such power comes from the soul of a tortured girl grafted into it by a cult from Silent Hill.
Malachite's Hand (Channel Awesome) was a powerful artifact that grants the user limitless magical power. Because the original gauntlet was old and unfashionable, the stone that powers it was grafted onto a Nintendo Power Glove.