Are we sure it'll take only one of each?

[Norbi]

I've never gotten one myself, but from what I've heard from people in my FC/LS, I was under the impression that you could only have a single Ifrit's Horn (for example) in your inventory at any given time (they're Unique and whatnot). If that's the case, It won't even be possible for a crafter to hold multiple of them if the craft called for it. So it's a safe bet you'll only need one.

[CUTS3R]

It won't even be possible for a crafter to hold multiple of them if the craft called for it.

Actually you can hold 2 at the same time.
1 on your inventory and 1 on your retainer, just like green gear / primal weapons.

[Estellios]

Actually you can hold 2 at the same time.
1 on your inventory and 1 on your retainer, just like green gear / primal weapons.

You still can't hold more than 1 on your person at a time since you can't craft stuff using materials on your retainer.

Unless they get the unique tag removed at some point there is no way an item requiring more than one of these mats is possible.

[Delsus]

Actually you can hold 2 at the same time.
1 on your inventory and 1 on your retainer, just like green gear / primal weapons.

Still when crafting only one can be used (the one on your person) but it's highly likely other items will be needed as well.

[Kal-El]

Still when crafting only one can be used (the one on your person) but it's highly likely other items will be needed as well.

So craft one item. Then take another horn out your inventory and craft something else?

[Delsus]

So craft one item. Then take another horn out your inventory and craft something else?

Which whilst is designed I highly doubt SE would do, unless you need so many horns from members of the FC, rather than use 20 retainers to store horns (Yes I know this is impossible.)

[juniglee]

Actually you can hold 2 at the same time.
1 on your inventory and 1 on your retainer, just like green gear / primal weapons.

Technically, 3 in total. Don't forget you have up to 2 retainers.

I have 2 Hearts myself, but don't know what to do with the spare one. The buying prices are a little too low for my liking for me to want to part with it now.