Fels (フェルズ) is a mysterious mage that is affiliated with Ouranos.
Fels wears black robes that cover their face, making it impossible to tell their gender or any other features. It is later revealed that they are a skeleton underneath their robes.
Fels works directly under Ouranos and will take any orders from him, although they will act on their own if necessary. They consider their experience creating the stone that granted immortality as their trauma.
Concurrent Chanting (並行詠唱): A high level technique involving casting magic while fighting or moving around. Its difficulty is likened to dealing with a bomb with both hands while fighting due to the chance of failing a chant or not being able to control their own magic power.
Dia Panakeia (ディア・パナケイア): Dia Panakeia is a healing magic which creates colored spheres of light that heal the target. Its effects are comparable to an elixir.
Dia Orpheus (ディア・オルフェウス): Dia Orpheus is Fels' resurrection magic only they know. It succeeded for the first time in 800 years by reviving Wiene.
Mage (魔導): Mage improves the power of Fels' magic, widens effect range, and makes mind usage efficient. It also creates a white colored magic circle under Fels when they use magic.
Mystery (神秘): Mystery enables Fels to create magic items. It's assumed that they are at a high rank in this development ability as they are known to be the Sage that created the Philosopher's Stone that granted immortality.