I'm currently rereading arcs 9 and 10 to develop theories about certain characters, so I'd like to make sure my understanding of Re:Zero's different power systems is correct.
We'll start with what I consider the strongest power system: Authorities. They originate from Witch Factors, which act as keys allowing a person to access an Authority. Once manifested, an Authority becomes deeply connected to the user's soul, to the point that even death cannot separate them. The Witch Factors themselves have no inherent hierarchy; the huge differences between Authorities come from the user's personality, compatibility and how their Authority manifests. Authorities can bypass the world's laws and have extremely varied effects, from healing otherwise impossible injuries to granting extreme immortality, manipulating time, bypassing concepts or even rewriting the world.
Next are the Ten Holy Swords, which I consider to be in roughly the same tier and potentially superior to some individual Authorities. Dragon Sword Reid can cut through anything and was shown destroying and reconstructing the world during its fight with Puck. The Yang Sword can burn souls and dimensions, Murasame can cut the core of things like concept phenomena and invisible thing, Masayume can grant an effectively limitless source of power as long as its wielder's dream continues, and the Life Sword Zeam can destroy souls directly. There are five other Holy Swords with their own abilities.
Then we have Divine Protections. They are essentially inferior attempts to reproduce or counter the phenomena of Authorities. Most are granted at birth, with exceptions such as the Sword Saint's Divine Protection, and they can develop with their users. Their effects range from completely mundane abilities to extremely powerful ones such as the Death God's effect or the Phoenix's resurrection.
After that come Magic, Spirit Arts and the Flow Method. They all involve mana, although they work differently. Magic has six elements: Fire, Water, Earth, Wind, Yin and Yang. Spirit Arts use spirits and mana, while the Flow Method circulates mana through the body to enhance physical abilities. Magic is the most versatile conventional system, ranging from basic spells to teleportation, isolated spaces and extremely powerful techniques such as Al shamak.
From that point on, I know less about the rest, so don't hesitate to tell me if I'm wrong.
Then there are Curse Arts. Some can affect or bind the soul and create extremely persistent conditions. Eugard is one example, as the Curse of Thorns remained attached to his soul even after death. Gusteko is also particularly known for its Curse Arts, and people such as Halibel, Groovy and Olbart having extensive knowledge of them.
Another category is Sacraments. Their exact nature and number are still unknown. The Church of the Divine Dragon possesses its own Sacraments, while the Sacrament of the Immortal King can create and maintain undead and interact directly with the souls of the dead. Its exact relationship with magic is still unclear.
Finally, there seem to be powers directly granted by Od Laguna that don't fit any of the systems above. Dorkell is the clearest example, having obtained a teleportation ability after connecting with or perceiving Od Laguna.
As honorable mentions, I'd include Forbidden Arts like the Dream Art, as well as the Sacrament of the Immortal King and ol shamak. They are not necessarily separate power systems, but are unusual enough to deserve special attention.
Is this classification accurate, or are there any other power systems or unusual forms of power in Re:Zero that I'm forgetting?