Carnevale of Horrors solo-run (after Return to the Night of the Zealot) :

Summary:

Took way too long (3 and a half hours)
Looking back, perhaps trying to time the Agenda may be a viable strategy.
Actually ran out of Shrivelling charges (x2) and didn't manage to draw it again after cycling the deck. May be worth to play Sacrifice or Recharge in this deck.
Didn't get to start with the Four of Cups, and it had an impact on starting flow.
It does feel like solo is easier than multiplayer for this scenario.

Carnevale of Horrors ( Standard difficulty )

1. Turn 1:
   Play Recall the Future (RtF)
   Play Sixth Sense
   to Venetian Garden (Abbess)
   Investigate ( 3 vs 3 shroud ) RtF: -1 (-2 : fail )

2. Turn 2:
   Encounter: Lost in Venice (move to Academia Bridge)
   Investigate (commit Sixth Sense) ( 4 vs 2 shroud ) RtF: -3 (-1 : success )
   Spend 1 clue: flip Masked Carnevale-Goer (Innocent Reveler)
   Parley ( 3 vs 2 ) RtF: (-1 : success )

3. Turn 3:
   Encounter: Carnevale Sentinel (spawn on Venetian Garden)
   take 1 resource
   Play Twilight Blade
   to Bridge of Sighs

4. Turn 4:
   Encounter: Poleman (spawn Canal-side)
   Sixth Sense (commit Guts) ( 4 vs 1 shroud ) RtF: (-1 : success )
   Spend 1 clue: flip Masked Carnevale-Goer (Innocent Reveler)
   Parley ( 3 vs 2 ) RtF: (-1 : success )

5. Turn 5:
   Encounter: Watcher's Gaze ( 2 vs 4 ) RtF: 0 ( : fail - 1 damage and horror to Innocent Reveler )
   Sixth Sense ( 2 vs 1 shroud ) RtF: (-1 : success )
   to Flooded Square ( take 1 horror )
   to San Marco Basilica (Abbess)
   Place Innocent Reveler

6. Turn 6:
   Encounter: Writhing Appendage
   Premonition (0)
   Fight Writhing Appendage ( 3 vs 2 ) ( 0 : success - 1 damage )
   Fight Writhing Appendage (commit Take the Initiative ( 5 vs 2 ) RtF: ( : success - 1 damage; Exhaust RtF )
   Kill Writhing Appendage
   Place Innocent Reveler

7. Turn 7:
   Encounter: Mesmerize (surge) - Acrid Miasma (on Canal-side)
   Play Jewel of Aureolus (JoA)
   to Venetian Garden (Abbess)
   Evade Carnevale Sentinel Dark Prophecy Diana's ability ( 3 vs 3 ) RtF: ( : success - Exhaust RtF )
   JoA ( 2 resource )
   to Streets of Venice

8. Turn 8:
   Encounter: Mass Hysteria ( shuffle Carnevale-Goers )
   Play Arcane Initiate
   Arcane Initiate : Storm of Spirits
   Play Twilight Blade
   Sixth Sense ( 3 vs 2 shroud ) RtF: (-2 : fail )

9. Turn 9: Advance Agenda (Spawn Baleful Reveler)
   Encounter: Carnevale Sentinel (spawn on Bridge of Sighs)
   Arcane Initiate : Shrivelling (finally!)
   to The Guardian (Streets of Venice)
   Fight Baleful Reveler ( 3 vs 4 ) RtF: -1 ( : fail - Retaliate ) "I've had worse..." Diana's ability Jewel of Aureolus ( draw Lita Chantler )
   Evade Baleful Reveler ( 3 vs 3 ) RtF: -1 ( 0 : success )
   Play Shrivelling

10. Turn 10:
    Encounter: Abduction Ward of Protection Diana's ability
    Arcane Initiate : Counterspell
    Shrivelling on Baleful Reveler ( 7 vs 4 ) RtF: ( : success - 2 damage / take 1 damage ) JoA (draw Recall the Future)
    Shrivelling on Baleful Reveler ( 7 vs 4 ) RtF: (-1: success - 2 damage )
    Twilight Blade on Baleful Reveler (commit Drawn to the Flame) ( 6 vs 4 ) RtF: -3 (-3 : success - 1 damage )
    Kill Baleful Reveler
    Enemy phase: Poleman (1 damage & 1 horror)

11. Turn 11:
    Encounter: Chaos in the Water ( 3 vs 4 ) RtF: -1 (-1 : success ; Exhaust RtF )
    Play Lita Chantler (take 1 damage & 1 horror)
    Twilight Blade on Poleman (commit Guts) ( 7 vs 4 ) ( : success - 2 damage ) JoA (draw Arcane Initiate)
    Arcane Initiate : -
    Twilight Blade on Poleman (commit Arcane Initiate) ( 6 vs 4 ) (0 : success - 2 damage )
    Kill Poleman

12. Turn 12: Advance Agenda (Flip Don Lagorio - engaged)
    Encounter: Poleman (spawn Canal-side)
    Arcane Initiate : Eldritch Inspiration
    Shrivelling on Don Lagorio ( 7 vs 4 ) RtF: -4 (-1 : success - 2 damage )
    Shrivelling on Don Lagorio ( 7 vs 4 ) RtF: -4 ( : success - 2 damage ) Eldritch Inspiration Diana's ability JoA (2 resources)
    Kill Don Lagorio
    Play Shrivelling (replace Shrivelling)
    Refresh : draw Terrible Secret Deny Existence

13. Turn 13:
    Encounter: Carnevale Sentinel (spawn Flooded Square)
    to Canal-side ( 6 vs 2 ) ( & -4 : success ) JoA (2 resources)
    Play Four of Cups
    Play Recall the Future (RtF)
    Arcane Initiate : -

14. Turn 14:
    Encounter: Writhing Appendage
    Arcane Initiate : -
    Twilight Blade on Writhing Appendage ( 7 vs 2 ) (-3 : success - 2 damage) Kill Writhing Appendage
    Spend 1 clue: flip Masked Carnevale-Goer (Savio Corvi) (1 damage & 1 horror) "I've had worse..." with Twilight Blade
    Shrivelling on Savio Corvi ( 8 vs 3 ) ( : success - 2 damage/take 1 horror ) JoA (2 resources)
    Enemy phase: Savio Corvi (1 damage & 1 horror) "I've had worse..." Diana's ability

15. Turn 15: Advance Agenda (Flip Elisabetta Magro)
    Encounter: Chaos in the Water ( 3 vs 4 ) RtF: 0 & -1 ( & 0 : success ; Exhaust RtF ) JoA (draw Dark Pact)
    Arcane Initiate : -
    Twilight Blade on Savio Corvi ( 7 vs 3 ) ( 0 : success - 1 damage )
    Shrivelling on Savio Corvi ( 9 vs 3 ) ( -2 : success - 2 damage )
    Kill Savio Corvi
    Play Dark Pact "I've had worse..." with Twilight Blade

16. Turn 16:
    Encounter: Acrid Miasma (on Academia Bridge)
    Sixth Sense ( 6 vs 2 shroud ) (-2 : success )
    Arcane Initiate : Eldritch Inspiration
    to Academia Bridge (6 vs 2) (-4 : success )
    Play Delve Too Deep
    Encounter: Watcher's Gaze ( 6 vs 4 ) RtF: -3 & (-2 : success )

17. Turn 17: Advance Agenda (Flip Innocent Reveler)
    Encounter: Chaos in the Water (commit Take the Initiative) ( 6 vs 4 ) RtF: -3 & -4 ( : fail - take 1 damage ) JoA: draw Delve too Deep
    Engage Elisabetta Magro
    Shrivelling on Elisabetta Magro ( 8 vs 3 ) ( +1 : success - 2 damage )
    Shrivelling on Elisabetta Magro ( 8 vs 3 ) ( 0 : success - 2 damage )
    Kill Elisabetta Magro
    Arcane Initiate : -

18. Turn 18:
    Encounter: Mass Hysteria (take 2 damage) Deny Existence Diana's ability
    to Bridge of Sighs
    Twilight Blade on Carnevale Sentinel ( 7 vs 3 ) (-2 : success - 1 damage )
    Play Storm of Spirits on Carnevale Sentinel ( 7 vs 3 ) (0 : success - 2 damage )
    Arcane Initiate : - (shuffle deck - 1 horror)

19. Turn 19:
    Encounter: Abduction ( 7 vs 3 ) (+1 : success )
    Premonition ()
    Arcane Initiate : Storm of Spirits
    Parley ( 3 vs 2 ) RtF: & ( : success - Exhaust 2x RtF ) JoA (draw Delve too Deep)
    Play Delve too Deep
    Encounter: Lost in Venice Ward of Protection with Twilight Blade

20. Turn 20: Advance Agenda (Flip Salvatore Neri)
    Encounter: Mersmerize (surge) Lost in Venice Dark Insight Diana's ability to Flooded Square
    Play Storm of Spirits on Carnevale Sentinel ( 7 vs 3 ) (-2 : success - 2 damage to each enemy )
    Play Storm of Spirits on Carnevale Sentinel ( 7 vs 3 ) (-1 : success - 2 damage to each enemy )
    Kill Carnevale Sentinel and Salvatore Neri
    to San Marco Basilica (Abbess)

21. Turn 21:
    Encounter: Watcher's Gaze ( 7 vs 4 ) ( : fail - 1 horror on Innocent Reveler ) JoA: draw Terrible Secret Deny Existence with Twilight Blade
    Place Innocent Reveler
    Advance Act
    to Venetian Garden (Abbess)
    to Streets of Venice
    to The Guardian (Streets of Venice)
    to Canal-side ( 6 vs 2 ( & : success )
    Advance Act

22. Turn 22:
    Encounter: -
    Premonition (-1)
    Row ( 4 vs 2 ) (-1 : success )
    Row ( 4 vs 2 ) RtF: -3 & (+1 : success )
    Row ( 4 vs 2 ) RtF: -3 & ( Counterspell : success )

23. Turn 23: Advance Agenda (Cnidathqua attacks) Dodge
    Encounter: Writhing Appendage
    Twilight Blade on Writhing Appendage (commit Guts) ( 9 vs 2 ) ( : success - 2 damage ) JoA: draw "I've had worse..."
    Kill Writhing Appendage (deal 1 damage to Cnidathqua)
    Row ( 4 vs 2 ) RtF: -3 & ( : success ; Exhaust RtF )

Scenario Ends ( R1: 8VP )

The sun banished Cnidathqua into the dephs
Abbess Satisfied