From Dota 2 Wiki
Not to be confused with an item's Quality.
Rarity is a property of cosmetic items. It is represented in-game by the item's color theme.
Rarity is a purely cosmetic property, and has no effect on gameplay.
- Items have both a Rarity and a Quality value.
- In general, rarer items tend to have more customizations.
- Lower rarity items drop more frequently than higher rarity items.
- Rarity does not determine whether or not an item is tradeable or marketable, Quality does.
|Ancient||#EB4B4B||Items gained from special events that are no longer obtainable.||Play Sound|
|Immortal||#E4AE33||Items that can no longer be obtained except from other players.||Play Sound|
|Arcana||#ADE55C||Items that grant heroes extensive customizations, including models, animations, particle effects, icons, and more.||Play Sound|
|Seasonal||#FFF34F||Temporary items for seasonal and event promotions. Will expire after a time.|