Attunement rules state that a character can only be attuned to three different magic items. Is the Attunement aspect of a magical item evident to the identifier? Is this intended to be knowledge about magic that a character is aware of? Or is this meta-knowledge for the mechanics of the game (like, a character isn't really aware of how many hit points they have)?
[RPG] Does identifying a magic item reveal to the character if the item requires Attunement
dnd-5emagic-items
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Best Answer
Identifying an item tells you if it requires attunement
There are two primary ways to identify a magical item. You can use the identify spell, which explicitly clarifies that you know if an item so identified requires attunement. Alternatively, you can take a short rest while holding and focusing on the item, at the end of which the character "learns the item's properties, as well as how to use them" - which must also mean that you know if it requires attunement, because that's a property of the item and if attunement is required that is part of knowing how to use the active properties.
The mechanics of attunement are not abstract and can be easily determined in-character, so are reasonable in-character knowledge
The Identify spell tells a character if an item requires attunement. Resting and meditating upon an item necessarily tells the character if it requires attunement. The rules for attunement describe that the creature is making a deliberate effort to try and attune with an item in order to use it. Clearly, the ability/requirement to attune with certain magical items can and must be in-character knowledge. Further:
Though a given creature may not know enough about magic to know that they can only attune to three items at a time, the rules mandate that attempting to attune to any more items automatically fails unless one of the existing attunements is broken, which again requires deliberate, in-character action on the part of the character (or other non-meta requirements to be met, like losing the item for long enough or someone else attuning to it). It would not be difficult to infer the 3-item limit by experimentation if you had enough magic items to hand.
You would expect that any creature with magical knowledge could know this rule of magic (I'd make it very easy Arcana check if I was even inclined to call for a roll), and any half-way intelligent creature could work it out by experimentation. The limit is a definite, "real-world" value, not an abstract quantifier like XP or hit points - it doesn't make sense, with the mechanics described, for a character not to be able to understand they can only attune to three items at a time.