For the originating Abnormality, see Portrait of a Certain Day.
Bygone Days is the name of the E.G.O extracted from the Abnormality Portrait of a Certain Day. All the Sinners who utilize this E.G.O dons simple tattered striped brown dress suit and pants, with a white shirt inside. The weapon used varies on the Sinner utilizing this E.G.O: Yi Sang wields a glass dagger resembling a piece from a shattered mirror, while Gregor uses his mutated right arm.
Information[]
Main article: Bygone Days Yi Sang
| “ | This is a portrait of theirs. Will you observe… a little closer? | ” |
–Yi Sang | ||
Obtaining[]
This E.G.O is obtained by the following means:
| Sinner | Risk Grade | How to obtain |
|---|---|---|
 Yi Sang |
ZAYIN | Season 4: Clear All Cathy Level 40 Paid Limbus Pass / Made with 400 Season 5+ Yi Sang Egoshards |
 Gregor |
TETH | Season 4: Clear All Cathy Level 30 Free Limbus Pass / Made with 400 Season 5+ Gregor Egoshards |
E.G.O
| |
|---|---|
| Unique E.G.O | |
| Sinner's E.G.O | Crow's Eye View -  Representation Emitter -  La Sangre de Sancho -  Forest For the Flames -  Chains of Others -  Land of Illusion  Bodysack -  Snagharpoon -  What is Cast -  Branch of Knowledge -  To Páthos Máthos - Suddenly, One Day
|
| Other E.G.O | Spicebush (Dongbaek) - Farmwatch (Dongrang) - GasHarpoon (Ahab) |
| Abnormality E.G.O | |
| Season 0 | Wishing Cairn (Pagoda Veneration) - Hex Nail (Hurting Teddy Bear) - Pursuance (Heavenly Executor's Scribe) - Ya Śūnyatā Tad Rūpam (My Form Empties) - Lantern (Faelantern) - Ardor Blossom Star (Ardor Blossom Moth) - Dimension Shredder (Wayward Passenger) - Red Eyes (Spider Bud) - Cavernous Wailing (Blubbering Toad) |
| Season 1 | 4th Match Flame (Scorched Girl) - Telepole (Alleyway Watchdog) - Fluid Sac (Headless Ichthys) - Ebony Stem (Ebony Queen's Apple) - Roseate Desire (Pink Shoes) - Impending Day (Doomsday Calendar) - Rime Shank (Baba Yaga) - Legerdemain (Golden Apple) - Screwloose Wallop (You Want To Get Beat? Hurtily?) (Have You Become Strong?) |
| Season 2 | Capote (Brazen Bull) - AEDD (Shock Centipede) - Sunshower (Drifting Fox) - Sloshing (Fairy Gentleman) - Red Sheet (So That No One Will Cry) |
| Season 3 | Effervescent Corrosion (Ambling Pearl) - 9:2 (Skin Prophet) - Blind Obsession (Dream-Devouring Siltcurrent) - Garden of Thorns (Sign of Roses) |
| Season 4 | Electric Screaming (Dreaming Electric Sheep) - Bygone Days (Portrait of a Certain Day) - Binds (The King in Binds) |
| Event-exclusive E.G.O | Lifetime Stew (Hell's Chicken) (Basilisoup, Season 1) - Soda (The Magic Hellbus) (Opened Can of WellCheers, Season 2) - Holiday (Miracle in District 20) (Sandolph, Season 3) Everlasting (Timekilling Time) (Time Duck, Season 4) |
| Walpurgis Night E.G.O | Regret (Forsaken Murderer) - Lantern (Meat Lantern) - Magic Bullet (Der Freischütz) - Wingbeat (Fairy Festival) - Sanguine Desire (Red Shoes) |