Rarity

Rarity is a descriptor that applies to all ancillaries, such as items and banners, in the game to indicate how powerful they are.
Ancillaries are divided into categories according to how likely they are to appear:
* Common
* Uncommon
* Rare
* Unique / Legendary - there is only one of each of these items in the campaign at a time
* Crafted (introduced in Total War: Warhammer II)
Some items are generic and can be gained by any race, while others will only appear for one specific race. For instance the Dawnstone is a generic item, while the Armour of Meteoric Iron is specific to The Empire.
Items can be granted as quest rewards, or even looted and stolen from other factions after a victorious battle. The same applies in reverse: the player can lose items if the Lord it was equipped to dies in battle. The exception is Legendary items which cannot be lost in battle. The player can gain multiple of the same item, except for Unique and Legendary items (see below).
Items owned by the player go into a list and can be equipped to or unequipped from characters at will. In the Campaign, there is generally a 1 turn waiting period before an item will be transferred from one character to another. Generally any character can use any kind of item, with three exceptions:
*Some unique items can only be equipped by the appropriate Legendary Lord (see below). These are sometimes called "Legendary".
**Other unique items can be given to any of your lords.
*Arcane type items can usually only be equipped by a spellcasting character.
===Unique Items===
Unique items are one-of-a-kind, usually gained through special quests such as the Monstrous Arcanum. For instance, there will only be one Sword of Khaine in the campaign at a time.
Some unique items are tied to a specific Legendary Lord, and can only be equipped by that Lord. They are usually gained through a quest, often culminating in a special set-piece battle, and cannot be stolen as post-battle loot. For instance, Ghal Maraz is specific to Karl Franz.
===Crafted Items===
In Total War: Warhammer II, crafting items was introduced. Some crafted items have the Crafted rarity.
*The High Elves can use the Rite of Vaul to cause an event which presents the player with a choice from a pool of High Elves crafted items.
*The Tomb Kings have the Mortuary Cult which uses Canopic Jars and trade resources to craft items.
*The Dwarfs have The Forge which uses Oathgold and trade resources to craft items. This was added in the Resurgent Update.
*The Heralds of Ariel faction, part of the Wood Elves race, has access to the Forge of Daith which enables certain items to be upgraded in rarity, including crafted.