Nightmares

Nightmares are summonable creatures in SINoALICE.

Summary
Nightmares are creatures with special skills that can be summoned to aid in battle. Skills can provide buffs and enemy debuffs, elemental weapon boosts, and SP boosts, among other effects. Every nightmare has a Story Skill and a Colosseum Skill that may or may not differ. Each player can summon a nightmare once during battle, and the same nightmare skills cannot be repeated among different players in a battle. Five nightmares can be equipped by a player at a time.

Nightmares can be obtained by story drops, raids, and though the medal exchange. Certain SS/SR nightmares are available in standard gacha pools, and can be summoned in place of a weapon. Paid SS/SR nightmares are also available for purchase in gem packs, and typically have the same skills as free SS/SR nightmares but higher stats. Gacha nightmares and paid nightmares require no SP to summon, while story and raid nightmares cost 50 SP to summon in story and 200 SP in Colosseum.

Nightmare List
For a complete list of nightmares, see the SINoALICE Database: