Advent

Advent is a type of stage added to the game along with the Spirit Merge feature. It helps you gain spirit points for gacha-only demons that can be used to upgrade them through Spirit Merge. Advent quests are divided into normal and Mayhem quests and are in rotation for 10 days at a time. Advent quests are accessed through the Demon Buster page in the game.

Standard and Mayhem Quests

• Standard quests can be cleared once per day during that quest's rotation period, and gives you 5 spirits each time you clear it.
• Mayhem quests can be cleared once during that quest's rotation period, and gives you 20 spirits when you clear it.
• Standard and Mayhem quests both costs 5 stamina to run.
• Standard and Mayhem quests both pits you against the rotation's featured demon (i.e. Advent Alice has you fight Alice, Advent Trumpeter has you fight Trumpeter)
• Standard and Mayhem quests of the same demon pits you against the exact same demon, with the difference being the restrictions placed on Mayhem quests:
  

1. Dx2 skills are disabled
2. All brand effects are disabled