Retainers, confirmed, you have to pay for them.

[Bixby]

If you need 40 Slots for Prism's you are doing something totally wrong:



They are just like other Catalyst's; stackable up to 99 x 5 different Grades mean with 1 Stack of each you can Glamour 495 Items. So i dont know what you need 40 Inventory Slots for.

5 grades times seven crafts = 35 inventory slots to cover everything if you want to keep them all stocked all the time instead of just buying them when you need them. It's right there in the image (as well as other images so far), Grade 1 Glamour Prism (Woodworking).