Arcana
A defeated boss can come back as a card in Rose's hand.
Check the Relics found by exploring.Arcana is the system that turns a won fight into a tool. Defeated bosses are sealed into Rose's tarot and become Arcana for spells and special actions. Death, Medusa, Carmilla, and Joan of Arc are among those bosses. The individual cards have no published titles, and no element, cost, or cooldown is published for a sealed card. A player can know who is eligible to be sealed and still not know the spell's title.
That limit is the whole practical guide for now. There is no grid of costs, elements, or cooldown numbers. The astrolabe screenshot is the public picture of the system's scale: Rose is small inside golden rings, with blood arcs and orrery spheres. It shows a machine, not a tooltip.
Who the store names, and who it does not
Death, Medusa, Carmilla, and Joan of Arc are the four names attached to the Arcana sentence. Their bios live with the rest of the cast. Death is Dracula's right hand and his scythe can slice through space. Medusa has the body of a giant serpent and a gaze that turns people to stone. Carmilla waits in the castle in a bloodstained dress. Joan's bio stops after the Hundred Years' War line. None of those bios prints the card that would seal them.
The Fallen, Isaac, and Dracula are published people without being repeated in that Arcana sentence. The Fallen terrorizes Paris and is the first threat in the sewers. Isaac is a devil forgemaster with a 20-year history with Trevor. Dracula is the king the earlier generation already killed once. Leaving them off the Arcana sentence is not the same as saying they cannot be bosses. It means the store did not use their names when it explained the tarot.
Special actions are mentioned in the same breath as spells. The text does not split them into two menus. A player should expect boss-derived moves and should not expect a published list of which input fires which seal. The opening-chapter demo may show an early case. The demo page also says some demo features and content may differ from the full version, so a card seen there is not automatically the final set.
The astrolabe room is the picture, not the list
The Arcana screenshot shrinks the hunter inside huge golden rings. Red arcs of blood cut across orrery spheres, a skeleton dial, gothic windows, and a red moon. The room is a conjuring space rather than a corridor. The rings are the visual argument that a sealed boss is a mechanism Rose stands inside, not only an icon in a pause menu. No label in the shot names a card.
Tarot language can tempt a longer occult glossary. The published word is Arcana, tied to bosses and to Rose. There is no printed major-arcana checklist, no upright and reversed text, and no shop that sells seals. Family's Grace, the Midnight Relic, is a locket-like bonus on the edition promo and is not described as a tarot card. Costumes of Trevor, Sypha, and Alucard change appearance. They are not additional Arcana.
Because the card names are absent, a guide that invented twenty-two titles would be fiction. The useful pre-release note is smaller. Learn the bosses from the cast page, expect at least the four named in the store sentence to connect to spells or special actions, and treat every other seal as unprinted until KONAMI shows it. The whip still does the trapeze travel while those spells sit beside it.
A skeleton dial inside the rings is a visible prop. It is not a published timer for a spell.
Orrery spheres make the room astronomical. They do not name constellations or card suits.
Blood arcs across the gold are the color argument of the curse meeting the mechanism. They are not a damage type list.
Gothic windows and a red moon tie the conjuring room back to the same night sky as the statue hall.
Special actions could be movement, a summon, or a strike. The store sentence allows all of those readings and confirms none.
Sealing a boss implies the fight happened. The text does not say the boss is gone from the castle afterward.
Joan's ellipsis and her place in the Arcana sentence can both be true. The card would be where a longer bio might have gone, and it is still unnamed.
Death's scythe that cuts space is a bio feat. It is not automatically the description of his seal.
Carmilla's bloodstained dress is a costume note in the bio, not a material cost for a card.
The Fallen can terrorize Paris and still be missing from the four-name Arcana sentence. Both lines are on official pages.
Golden rings around a small hunter are the scale cue in the shot, and they do not carry numbers for damage or duration.
A skeleton dial inside those rings is visible machinery, not a published cooldown.
Blood arcs across the orrery are the color of the curse meeting the mechanism, and they are not a typed element list.
The red moon in the conjuring room matches the moon over the statue hall, so both shots share one night rather than two eras.