Soul Cage Spell

[Thrasher92]

On page 165 of Xanathar's Guide to Everything there is a spell labeled "Soul Cage".

I don't see anything in the spell that says you can't have more than one soul cage active at one time, but am I missing something? I assume there isn't a limit because there is only an 8 hour duration which would apply enough of a limit that it wouldn't matter if you have more than one soul trapped at a time.

[bc56]

The spell doesn't need concentration, so as far as I can tell, if you have the slots for it, you can have two or more at the same time.

It is effectively creating a temporary magic item, so I don't know why you shouldn't be able to have two at once.