So 3rd Generation Reyvateils are originally born as humans but if their mother was a Reyvateil they may develop into one later in life.
From my understanding all Reyvateil have an install port surrounded by a tattoo and since Gathnode Crystals and Life Extending Agents are Physical Objects that get inserted into a Reyvateil with both being somewhat painful this would make it into a hole right?
But i can't imagine how this hole appears. does the skin just open up one day? does a Reyvateil have to go under some procedure to have it made (ie. when they get their first Life Extending Agent) or is it a gradual process?