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The nature of the Great Waterfall and Od Lagna's soul filtration

Shaula's perception of Subaru and Master Flugel

Authority compatibility and rejection symptoms in non-compatible hosts

Q: When ingesting a Witch Factor, what reaction occurs if the host lacks natural compatibility?

The distinction between Spirits, Great Spirits, and Artificial Spirits

Q: What is the difference between 'Artificial Spirits' like Beatrice and Puck, and naturally occurring Great Spirits?

Gospel deviations and Roswaal's interpretation of absolute destiny

Q: When events occurred that were not inscribed in the Tome of Wisdom (Gospel) Roswaal possessed, how did he interpret them?

The nature of Beatrice's contract and Subaru's defective gate

Q: At the end of Arc 4, Subaru's gate completely broke. How do they cast magic under his contract with Beatrice?

Garfiel's shield technique and the legacy of the Cremaldy demi-humans

Q: What is the origin of the dual tower shields Garfiel wields?

Otto Suwen's Divine Protection of Soul Language and animal psychology

Q: When Otto converses with animals using his 'Divine Protection of Soul Language,' does he hear the voices of insects and microorganisms as well?

Emilia's magical potential compared to Roswaal and Echidna

Q: In terms of pure raw mana quantity alone, how does Emilia compare to Roswaal and Echidna?

Why Reinhard cannot solve every tragedy despite unlimited power

### Regarding why tragedies still occur despite Reinhard being the undisputed strongest in the world Reinhard is 'a man who cannot lose in combat,' but he is not 'a man who can save everyone.' He cannot teleport anywhere instantaneously, nor can he predict where malice will strike in advance. The deaths that transpire before his arrival and the disintegration of human hearts cannot be prevented with a holy sword.

Julius Juukulius and the spiritual burden of his element rainbow

Q: Globally speaking, how rare is it that Julius is contracted with quasi-spirits of all six elements?

Why Subaru retains memories of people erased by Gluttony

Q: Even though Rem's existence was erased from the world's memory by Gluttony, why was Subaru alone capable of clearly remembering her?

Petelgeuse's Unseen Hand number and capacity limits

Q: What is the maximum number of 'Unseen Hands' Petelgeuse can manifest simultaneously? How does it differ from what Subaru can use?

The White Whale's Fog of Elimination mechanics

Q: Is the phenomenon where memories of victims struck by the White Whale's 'Fog of Elimination' vanish from the world based on the same principle as the Sin Archbishop of Gluttony's Authority?

Subaru and Return by Death save points selection

Q: How are the save points for Subaru's 'Return by Death' determined? Can they be moved by Subaru's own conscious will?

Rem and Ram's horn power distribution before the massacre

Q: Oni clan twins have only one horn each, but if Ram had never lost her horn, how high would her combat potential have reached?

Subaru's personal mana affinity and gate capacity

Q: Subaru's magical affinity is Yin attribute, but in world standards, how strong is his gate and mana pool?