The Garden of Sinners Collaboration Event (US)/Main Quests

Room 101
Complete Mansion Entrance to unlock.

Room 102
Complete Mission 11 to unlock.

Room 104
Complete Room 102 to unlock.

Room 204
Complete Room 203 to unlock.

Room 304
Complete Mission 35 to unlock.

Room 404
Complete Mission 39 to unlock.

Room 504
Complete Mission 18 to unlock.

Room 601
Complete Mission 54 to unlock.

Room 604
Complete Mission 49 to unlock.

Room 701
Complete Mission 26 to unlock.

Room 704
Complete Room 604 to unlock.

Room 801
Complete Room 704 to unlock.

Room 804
Complete Mission 72 to unlock.

Notes
 * Heroine X has two unique abilities in this quest:
 * Gain Guts (65,000 HP).
 * Gain Invincibility (1 turn).

Incinerated Remains
Complete Mission 81 to unlock.

Strategy

This quest cannot be beaten by the usual "spray and pray" means. Bring your own Ryougi Shiki (Assassin) and put her and support Ryougi Shiki (Saber) in the front line. Charge Ryougi Shiki (Saber)'s Noble Phantasm, then use Shiki Saber's first skill to increase the Voids' vulnerability to Death effects. Shiki Saber's Noble Phantasm should instantly kill all 3 Voids. If any are left over, charge and use Shiki Assassin's Mystic Eyes of Death Perception and Noble Phantasm.

Rooftop
Complete Mission 98 to unlock.

Complete Mission 100 to unlock.