Observation Logs

Observation Logs are information records about Abnormalities, Distortions, and Effloresced E.G.O users that the Sinners face in combat that are written by the Sinners. The logs tend to theorize on the enemy's methods of attack and how to best defeat them, but also often feature the Sinner describing their thoughts regarding the subject in a more personal manner. As the enemy's Observation Level increases through killing the enemy multiple times, more levels of the Observation Log are unlocked.

List of Observation Logs

Icon	Subject	Log Writer	First Encountered
	Ebony Queen's Apple	Faust	Canto I: The Outcast
	Doomsday Calendar	Yi Sang	Canto I: The Outcast
	Clay Dolls	Faust	Canto I: The Outcast
	Golden Apple	Gregor	Canto I: The Outcast
	Have You Become Strong's Cyborgs	Ishmael	Canto II: The Unloving
	Pink Shoes Enchantee Pink Shoes Possessee	Hong Lu	Canto II: The Unloving
	Clippity-cloppity? Tap Away!	Meursault	Canto II: The Unloving
	Baba Yaga's Subordinates	Rodion	Canto II: The Unloving
	Feral Mane Corrosions	Ishmael	Canto III: The Unconfronting
	Mimicry Corrosions	Heathcliff	Canto III: The Unconfronting
	Coil Corrosions	Rodion	Canto III: The Unconfronting
	Kromer	Sinclair	Canto III: The Unconfronting
	Kromer the Dreamer of Human Wholeness	Sinclair	Canto III: The Unconfronting
	Headchicken	Don Quixote	Intervallo I: Hell's Chicken
	Papa Bongy	Outis	Intervallo I: Hell's Chicken
	Spiced-up Papa Bongy	Outis	Intervallo I: Hell's Chicken
	Brazen Bull	Meursault	Canto IV: The Unchanging
	Lobotomy E.G.O::Sunshower - Dongbaek	Yi Sang	Canto IV: The Unchanging
	Dongbaek E.G.O::Spicebush	Yi Sang	Canto IV: The Unchanging
	Fairy Gentleman	Rodion	Canto IV: The Unchanging
	So That No One Will Cry	Heathcliff	Canto IV: The Unchanging
	Drifting Fox	Sinclair	Canto IV: The Unchanging
	Shock Centipede	Gregor	Canto IV: The Unchanging
	Dongrang, Who Denies All	Yi Sang	Canto IV: The Unchanging
	Effloresced E.G.O::Farmwatch	Yi Sang	Canto IV: The Unchanging
	Ambling Pearl	Sinclair	Canto V: The Evil Defining
	Skin Prophet	Outis	Canto V: The Evil Defining
	Dream-Devouring Siltcurrent	Don Quixote	Canto V: The Evil Defining
	Effloresced E.G.O::GasHarpoon	Ishmael	Canto V: The Evil Defining
	Distorted Bamboo-hatted Kim	Outis	Intervallo III: Yield My Flesh to Claim Their Bones
	Hindley, The Reaved Lamenter	Heathcliff	Canto VI: The Heartbreaking
	Heathcliff, The Heartbroken	Don Quixote	Canto VI: The Heartbreaking
	Fairy Festival	Faust	The 3rd Walpurgis Night
	The Time Ripper	Hong Lu	Intervallo IV: Timekilling Time
	Cassetti's Bloodbags (Passengers)	Heathcliff	Intervallo IV: Murder on the WARP Express
	Cassetti's Bloodbags (Cleanup Agents)	Heathcliff	Intervallo IV: Murder on the WARP Express
	Cassetti's Bloodbags (Prosthetic Fixers)	Heathcliff	Intervallo IV: Murder on the WARP Express
	Sasha	Gregor	Intervallo IV: Murder on the WARP Express
	Cassetti	Faust	Intervallo IV: Murder on the WARP Express
	Fruit of Understanding	Rodion	The 4th Walpurgis Night
	Grant Us Love	Sinclair	The 4th Walpurgis Night
	Hurting Teddy Bear	Rodion	Canto VII: The Dream Ending
	Rose Hunter	Hong Lu	Canto VII: The Dream Ending
	Four-hundred Roses Corrosions	Meursault	Canto VII: The Dream Ending
	Distorted Hohenheim	Heathcliff	Intervallo V: LCB Regular Check-up
	Jia Mu	Hong Lu	Canto VIII: The Surrendered Witnessing
	The Knight of Despair	Faust	The 6th Walpurgis Night
	Peccatulum Irae Class 1	Heathcliff	Canto I: The Outcast
	Peccatulum Irae Class 2	Heathcliff	Intervallo III: Yield My Flesh to Claim Their Bones
	Peccatulum Irae Class 3	Heathcliff	Canto VI: The Heartbreaking
	Peccatulum Luxuriae Class 1	Sinclair	Canto III: The Unconfronting
	Peccatulum Luxuriae Class 2	Sinclair	Canto VII: The Dream Ending
	Peccatulum Pigritiae Class 1	Yi Sang	Canto I: The Outcast
	Peccatulum Pigritiae Class 2	Yi Sang	Canto VI: The Heartbreaking
	Peccatulum Pigritiae Class 3	Yi Sang	Intervallo V: LCB Regular Check-up
	Peccatulum Gulae Class 1	Ishmael	Canto I: The Outcast
	Peccatulum Gulae Class 2	Ishmael	Canto VI: The Heartbreaking
	Peccatulum Morositatis Class 1	Meursault	Canto II: The Unloving
	Peccatulum Morositatis Class 2	Meursault	Intervallo III: Yield My Flesh to Claim Their Bones
	Peccatulum Morositatis Class 3	Meursault	Intervallo V: LCB Regular Check-up
	Peccatulum Superbiae Class 1	Faust	Canto III: The Unconfronting
	Peccatulum Superbiae Class 2	Faust	Canto VII: The Dream Ending
	Peccatulum Invidiae Class 1	Rodion	Refraction Railway - Line 4: Masquerade
	Peccatulum Invidiae Class 2	Rodion	Refraction Railway - Line 4: Masquerade
	Alleyway Watchdog	Yi Sang	Mirror Dungeon - Mirror of the Beginning
	Headless Ichthys	Meursault	Mirror Dungeon - Mirror of the Beginning
	Fairy-Long-Legs	Ishmael	Mirror Dungeon - Mirror of Mirrors
	Blubbering Toad	Ishmael	Refraction Railway - Line 1: MADNESS
	kqe-1j-23	Gregor	Refraction Railway - Line 1: MADNESS
	My Form Empties	Faust	Refraction Railway - Line 1: MADNESS
	Steam Transport Machine	Don Quixote	Refraction Railway - Line 2: Möbius
	Faelantern	Outis	Refraction Railway - Line 2: Möbius
	Wayward Passenger	Meursault	Refraction Railway - Line 2: Möbius
	Sign of Roses	Hong Lu	Refraction Railway - Line 2: Möbius
	Drenched Gossypium	Heathcliff	Refraction Railway - Line 3: MirrorClock OrangeRoad
	Ardor Blossom Moth	Yi Sang	Refraction Railway - Line 3: MirrorClock OrangeRoad
	Spiral of Contempt	Rodion	Refraction Railway - Line 3: MirrorClock OrangeRoad
	Portrait of a Certain Day	Gregor	Refraction Railway - Line 4: Masquerade
	Dreaming Electric Sheep	Sinclair	Refraction Railway - Line 4: Masquerade
	The King in Binds	Yi Sang	Refraction Railway - Line 4: Masquerade
	Sleeping Bag of a Bygone Day	Outis	Refraction Railway - Line 5: Merry Go Round
	Der Fluchschütze	Heathcliff	Refraction Railway - Line 5: Merry Go Round
	Four-hundred Roses	Don Quixote	Refraction Railway - Line 5: Merry Go Round

Trivia

• Ryōshū is the only Sinner to have not written any Observation Logs.
• Kromer and Dongbaek are the only exceptions to Observation Logs being exclusively written about Abnormalities, Distortions, and Effloresced E.G.O users, as Kromer's first phase and Dongbaek's Lobotomy E.G.O::Sunshower fight both have Observation Logs.
  • This is likely due to Focused Encounters being named Abnormality Encounters at the time that these fights released, and it was presumably planned for all enemies fought in these Abnormality Encounters to have Observation Logs regardless of if they were Abnormalities or not. With the change to rename this type of battle to Focused Encounters and include human enemies of lesser story importance, the requirements for which enemies receive Observation Logs was likely also changed.
• The Bloodfiends and Bloodbags fought in Intervallo IV: Murder on the WARP Express received Observation Logs while the ones fought in Canto VII: The Dream Ending did not. The reason for this is unclear, but possibly relates to the ambiguous classification of Bloodfiends as being similar to, yet still distinct from, Distortions.