User blog comment:KodachiZero/Chain Chronicle V3 on the Wiki + Q&A/@comment-122.55.57.66-20161125094300/@comment-3215051-20161201080303

Finalized one: Initiation Skills require two things to teach a character it: A teacher and a receiver. The receiver (has the blank map instead of the class symbol) needs to have Relationship Level 10 and the teacher needs to be level 40 (like when they unlock Chain Abilities).

The teacher and receiver have to be of the same class (Warrior, Knight, Archer, Magician, or Cleric), and they have to fight in the same party for a chance for the receiver to learn the skill at the end of it. However, the receiver can only have one Initiation Skill at a time, and it has to be deleted before it can be overwritten.

Usually, the initiation skill is based on one of the skills of the teacher. Of course, it'll tend not to be a skill that changes the terrain or something of that sort and will usually be the skill that actually does something directly or is the one usually activated in the case of characters with multiple skills. [Zero]