Nightmare is the name of the Gacha system in Obey Me!. The player is given multiple pools to "summon" in, which yield different rewards. There are three basic pools: Chapter A, Chapter M, and Chapter G. There are also Event Nightmares that are available for a limited amount of time.
In order to summon in an Event Nightmare, Chapter A, or Chapter M, the player must spend 30 Devil Points or 1 Demon Voucher to summon once, and 270 Devil Points or 10 Demon Vouchers to summon 10 times. When doing a x10 summon in these pools, an SSR or higher card is guaranteed. Chapter G requires the player to spend 3,000 Grimm or 27,000 Grimm in order to summon once or ten times respectively.
The player is awarded a free summon once every 48 hours in Chapters A and M, and one once every 24 hours in Chapter G. For VIP members, these times are halved to once every 24 hours in Chapters A and M, and once every 12 hours in Chapter G.
|Event Nightmares, Chapter A, and Chapter M Summon Rates|
|Chapter G Summon Rates|
Within the Nightmare app, players are able are able to check the rates for specific cards. These can be seen by tapping the "rewards" planchette located in the bottom-left corner, then tapping the "Odds" button also located bottom-left.
- In the game's tutorial, it was mentioned that Nightmare is a magic book app (aka a grimoire app), and that the Royal Library of the Devildom is in charge of it.