I'm in the desert now and I picked up the Flamberge for Yuri and learned the chain skill. I used Azure Storm a bunch of times, and it said "new arte learned" (so I can use it without having the sword, or the skill equipped) but in Yuri's artes menu it still only has Azure Edge, not Azure Storm. Is there another step I need to do?
No you have to have the actual skill (chain) for azure storm to work. If u dont have that equiped it will go back to azure edge. So learn chain, equip the skill, and you'll be able to use azure storm w/o the flameberg