The miliennium items, will be keeped safe by the Guardian along with the three dragons god. To have such an item, you will have to be found worthy of it. If you are found worthy enought the item will appear to you one way or the other.
Althought you might be worthy, you will have to defend it other player that want to have such items can freely duel for them, thought it will become a Shadow Duel.
To have such an item, you will also need to not posses an ability, it does not mean you will be worthy to have one, hence if you are not worthy of it, you will have no ability whatsoever. Be very cautious of your choices.
Millennium Puzzle
With this item power, you can make a shadow duel a normal one.
Millennium Eye
In a duel, you can see every cards in your opponent's hand, until the end of the duel. Also, give the owner the ability of seeing duel spirit.
Millennium Scale
You can fusion summoned, without having polymerization,ect. You can determined if a person is good or evil.
Millennium Key
You can travel to both Shadow Realm and the Spirit World, by opening a ten seconds portal to said realm/world.
Millennium Rod
Given the power of mind over matter, with this item, you can control the mind of others by a simple look with there eyes on the Rod. You can also instead of sending your opponent's soul to the Shadow Realm, crush there mind, leaving them be with no mind whatsoever.
Millennium Necklace
Give the ability of hearing and talking to Duel Spirit. Also give the possibility of always suceed in a skill check.
Millennium Ring
Gives the ability of sensing other Millennium items nearby. Also makes the wearer immune to having their mind crushed or read. Houses the spirit of Thief King Bakura.
