Hikalcum is a rare mineral capable of storing and emitting Light essence by charging during the day from sunlight.[1] Most notably, both Light adepts and even non-adepts of the Kaiho army utilize this mineral by infusing it into their weapons, giving them the ability to use Light essence against Nisshoku forces, in which are Shadow adepts and are weak against attacks made of Light essence.[2]


  1. Aragami - Guard dialogue
  2. Volume 14: The War to Come