Spell List: The Occult List
The Occult Spell List
Occult magic is considered the power of the unknown, a power which does not fall into the normal conjecture of sciences and libraries. A source of power from an Occult source could be a Patron from a distant realm or ancient teachings that predate modern methods of magical practice.
Innately, Bards (and Troubadours), Warlocks, and Witches practice Occult magic, though a few others fall into the esoterica that, as the nature and mystery of the Occult harkens to those who look for it.
Any spellcaster who uses the universal Occult Spell List has access to these spells via their class, ancestry, or whatever else. Spells with this page/trait are considered "Occult" in nature.
As you guessed, Occult magic tends to trend towards the dark and edgy. That's why it's usually Purple.
...and, more popularly, black.