Lore
Perfect Unknowable
完全不可知化（パーフェクト・アンノウアブル）
Magic & Power SystemsKey Spells & Skills
A 9th-tier spell, the ultimate invisibility, which erases even sound and presence; it ends when the caster attacks and can be cast only on oneself.
- 9th tier: hides not only the body but all sound and presence; the effect ends once the caster attacks (Vol. 11)
- It cannot be cast on others, and Mare does not know it; it can be sealed in scrolls and staves but not in wands (unless a "wish to the operator" World Item is used)
- In YGGDRASIL, it was considered a spell for dealing with large numbers of lower-level enemies; opponents at Momonga's level often had ways to see through it, so players usually used consumables instead of learning it
- It drains MP continuously while maintained; among the Pleiades, only Lupusregina can see through Perfect Unknowable without items (Vol. 13); druids can learn a spell that sees through it (Vol. 16)
- In the BD bonus novel Prologue (Part 2), Momonga combined it with [Remote Viewing] to scout ahead; the light novel source is Vol. 11
Notes
Sources list it among "spells with high MP consumption" (while the effect lasts).
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