Here's the old paths of magic subreddit. It's technically dead as I created a new one. I just haven't posted anything in the new subreddit as of yet. But, there's some good art there and some lore too. Some of it might be outdated and retconned.

Apotheosis_Terra (reddit.com)

Here's some drawings and diagrams of the ethereal body, if you're interested. Got back to digital drawing. This is all current lore.

The Ethereal Body : magicbuilding (reddit.com)

Here's some explanation on the different Paths of Magic, or classes if you will. Ways are technically subclasses.

Mage Classes : magicbuilding (reddit.com)

Fruits of the Yggdrasil:

Here's the world of Urnweld, dark-souls-esque magic where mages wield the essence of Ash.

Urnweld, The Ashen Arts : magicbuilding (reddit.com)

Here's the world of Vyn, where the blood of the stars color the soul.

Vyn - The Colors of the Soul : magicbuilding (reddit.com)

Here's the world of Yurn, where magic is handed down through eldritch beings living far beyond the blackened night sky.

Sigil Magic : magicbuilding (reddit.com)

Here's the world of Erebus, a place where magic is bound to light and shadows.

Erebus - The Inks of Creation (Part I) : magicbuilding (reddit.com)