Yup, Gifts of the Old Ones.

All artwork in .png format can be used in CC3+.

Generally just put the .png files in a folder under the Symbols\User folder in your CC3+ data directory, and optionally import them into symbol catalogs.

Of course, CC3+ symbols are more than just the backing image, they have properties and configuration to make things easier, like houses that aligns to roads and doors that cut walls and symbols that automatically go to the right sheet. Artwork not made for CC3+ won't have all these properties unless you set everything up for it.

Well, on those cliffs you could end up doing other kinds of rolls too.....

Maybe I'll do that one day. But it is basically this:

I seemed to already have an account on there, so gave him an answer, but my answers in this regard are unofficial, I can't give an official license interpretation on behalf of ProFantasy, for that he needs to contact them directly.