I'm not sure this is the case though, because in a storyline quest Matoya uses a crystal of light from long ago (that orb thing), since they are more powerful than the ones nowadays (Iirc, it's been a while since I did that quest so I could be mis-remembering). If anything Hydaelyn may be growing weaker over time. That's what has lead me to believe maybe our character itself is becoming too powerful.
