I just got a strange error on the souls page. Going into fragments, I got a pop-up saying I've exceeded my souls slots and I wont be able to accrue more until I use some.

What I cant seem to find out is what the limit actually is? There is no x of y type indicator the way it is with runes/shards/chars etc.

So it the soul maximum due to total numbers, or number of different stacks? And any way to work out how many you are allowed?

Thanks!