"The image I had is that the red part of a white mage's robe is embroidered from red threads imbued with magic when spun together, increasing the wearer's magical power. The reasoning for the red threads being on the sleeves is that magic leaves the body through the hands and wrists, so that area is most effective. I was very particular about the lore that equipment like wands and amulets are used as a catalyst to turn natural power into magic, stimulating the user's magic strength. That's why I was adamant about never giving magic users iron equipment; if they use normal metals, their magic power will disperse so at least go with mythril ore...stuff like that.

[...] when [the dark knight is] KO'd in battle only their armor is left, as if the body inside has disappeared. The reason for that, in my imagining, is that they have a dark pact where their body is engraved with dark magic runes, and when they're KO'd the dark magic runes take their soul and body so only the empty armor remains. I had that kind of unique image for each job as I was creating it."