You can gain this ability at any time when creating your character or leveling up, so long as you meet its prerequisites.
You gain the ability to cast Spells, Techniques, and Rituals.
You gain +1 free rank of the Elemental Affinity Feat.
Spells you cast are always Spirit Magic.
You use Charisma for your spellcasting attribute.
Spirit Magic spells use Verbal components for their casting and Emotional components for their Metamagics.