From LSWiki

Class: Affinity Skills
Attribute: Willpower
Pedagogy: Spirit Alteration
Practitioner Term: Goetic Investee
Specialty Required: Degree I
Hidden Skill

This skill represents an infusion of goetia, also known as theophanic energy -- the power of divine
influence in mortal affairs -- into one's essence, making one resistant to the influence of goetic forces,
potentially even to the point where exposure that would have been harmful is instead restorative.  However,
the greater an affinity for these energies one develops, the more vulnerable one becomes to raw magickal
energy.

Trainers