Yes, there are experience (XP) boosting accessories in Metaphor: ReFantazio, but they are limited to specific types of XP boosts. Here are the details:

1. Archetypal Ring:
– Location: Sold by the Nidia Shopkeeper in Brilehaven, but only on Watersdays.
– Effect: Increases the amount of XP an Archetype earns whenever equipped. This ring only benefits the wearer and does not increase normal EXP rates.

2. AEXP Boosting Accessories:
– Location: These accessories, which boost AEXP (Archetype-specific EXP), can be purchased on Watersdays in Brilehaven. However, there are no accessories that boost normal EXP rates.

In summary, while there are no accessories that boost normal EXP rates, there are specific accessories like the Archetypal Ring that enhance Archetype-specific XP.