Not all arcanists peer inward to discern the deepest secrets of magic. Some look outward, connecting with extraplanar creatures and bartering for secrets, power, and favor.
The occultist is an archetype of the arcanist class.
An occultist adds all planar ally spells to her spell list (using her arcanist level as the cleric level), and treats plane shift as a 5th-level arcanist spell.
An occultist can spend 1 point from her arcane reservoir to cast summon monster I. She can cast this spell as a standard action and the summoned creatures remain for 1 minute per level (instead of 1 round per level). At 3rd level and every 2 levels thereafter, the power of this ability increases by one spell level, allowing her to summon more powerful creatures (to a maximum of summon monster IX at 17th level), at the cost of an additional point from her arcane spell reserve per spell level. An occultist cannot have more than one summon monster spell active in this way at one time. If this ability is used again, any existing summon monster immediately ends.
At 20th level, an occultist can use her conjurer’s focus without spending points from her arcane reservoir, and the creatures summoned last until dismissed.
This ability replaces magical supremacy.