Mythical Items are a new type of item in Labyrinth of the Minotaur, which go in a new item slot (on your inventory screen, it appears directly above your head). These items drop only in the Labyrinth or from Labyrinth encounter mobs. They can also be called "mythirian" items, since it's in the name of each item, but I'm going to stick with mythical - I find it easier to spell.

Tiers

There are three tiers of mythical items, each with a different CL requirement. The most common mythical items require CL6; the next tier require CL8; and the most difficult to get mythical items require CL10. Within each of these tiers, most mythical items have three levels - lesser, average, and greater. The exception to this is the resist (and resist + resist cap) items, which only have a single level.

Binding

Mythical items introduce to DAoC a system that will be familiar to the millions of players of a certain other game. They can be traded to anyone, vaulted, etc - until they are equipped. Once you equip a mythical item, it is bound to you, and cannot be traded to other players. Mythic has cleverly dubbed this mechanic 'bind on equip'.

Where You Get Them

The most common way to get a mythical item is simply to kill regular monsters in the Labyrinth. All the mobs (aside from the ones in each realm's entrance area) have a chance to drop mythical items. They will drop lesser and average level items, however.

For the "greater" mythical items, you will need to kill encounter bosses. Each encounter is associated with a mythical item tier, and when the boss is killed you have a chance to receive a "greater" item from that tier. The most desired mythical items will be drops off of the most difficult bosses.

The Bonuses

The bonuses of mythical items stack with every other bonus, and the cap increases go past the normal caps. So with a Bolstering Mighty Mythirian equipped, the maximum amount of strength from items would go from 101 to 109. A Protector's Bluntbender Mythirian will increase your crush resist cap from 26% to 32%.

Tier two stat and resist items not only increase the cap, but also give you the same amount of bonus as the cap is increased. So that Protector's Bluntbender Mythirian mentioned earlier would not only increase the cap to 32%, but it would give you 6% crushing resist - so if you were at 25/26% before, with this item you'd be at 31/32%.

+Evade/Parry/Block items do not give you a chance to do those things if you cannot already do so. If you can't parry already, getting a +parry mythical item won't give you any bonus.