In few words, it's just a way for the game to reduce you capacity to wear anything, anytime; because you have 4 slots for accessories and some. More Accessory Slots are available in the Crystarium as you advance through the game (last slot is unlocked at Stage 10). I'm done with the game and am in past Lucsis now. And it's honestly the most ingenious and fun upgrade system I've ever used. Recommended Accessory Setups: My recommended accessory slots go in order. So, each weapons and accessory can be leveled up and you have. . An Ascension ability in Final Fantasy XV. A mechanic in Final Fantasy XIII and Final Fantasy XIII; accessory slots are unlocked in the Crystarium system. So if you have three slots unlocked, use the first three and so on. For a list of the unique/limited-. I've seen many videos where people have 3 accessory slots. 4 accessories (1 by default and 3 through upgrades in the Chrystarium, though 3 is the max prior to beating the game). For some reason I only have 2. That unlocks the 10th stage of the Crystarium, which contains each character's 4th Accessory slots (and the 5th role levels, and a ton of +HP). Accessories are items that bolster the capabilities of Schema in Lightning Returns: FF The 4th Accessory slot for each character will be in whichever primary role hasn't already unlocked an extra Accessory slot.