Colour-Coded Loot Rarity

Item generation picks a rarity tier, then rolls properties within that tier's range, and the display colours the item's name accordingly. White is ordinary, blue better, gold or orange exceptional. Player learns the language in minutes and can then triage a floor of drops without opening anything. Colour also drives feeling directly, since the flash of an unusual tint is a reward delivered before its contents are known.

Blizzard North needed players to sort through enormous quantities of generated items in Diablo in 1996 without stopping to read, because the game's loop is killing and looting at speed. Colour is the cheapest possible interface for that, requiring no text, no icon and no localisation. Convention it established proved so effective that games in unrelated genres adopted the same palette without ever explaining it.

One-glance value became the medium's most portable interface convention and, in parallel, its most exploitable. Rarity colours make a randomised drop feel like an event, which is exactly the property loot boxes and gacha systems monetise, and the flash works whether the item beneath it matters or not. Designers who want players to read items rather than colours now have to work against the expectation.