Nightmare (ナイトメアヴィジョン, Naitomea Vijon, lit. "Nightmare Vision")
Attributes		Target	Gauge Cost	Damage
Magic	Upright	All	2	7★: x8.14
7★: Deals 11 hits. 2 turns: ↑ U-STR by 1, PSM-STR by 1, ↓ targets' PSM-DEF by 1.
Nightmare EX (ナイトメアヴィジョン改, Naitomea Vijon Kai, lit. "Nightmare Vision Revision")
Attributes		Target	Gauge Cost	Damage
Speed	Upright	Single	7	7★: x14.46
7★: Deals 11 hits. 1 turn: ↑ U-STR by 3, S-STR by 7. Fills 4 gauges.
Magic	Upright	All	4	7★: x10.02
7★: Deals 11 hits that ignore targets' attributes. 1 turn: ↑ U-STR 3, SP ATK B +120%.

Nightmare is a technique introduced in Kingdom Hearts Union χ.

Development

Originally, the English version of Nightmare was different from the Japanese version, with the buffs and debuffs only lasting one turn instead of two. However, the official notice announcing the Medal erroneously showed the effect lasting two turns. After many players complained, Square Enix changed the effect to match the one shown in the notice.^[1]

Mechanics

In Kingdom Hearts Union χ, Nightmare is a special attack that targets all enemies. It costs 2 special attack gauges to perform.

Special attack	Rarity	Base	•	••	•••	••••	•••••		Hits
Nightmare +5	6★	x2.54	x2.62	x2.70	x2.78	x2.86	x2.94		11
Nightmare +6	7★	—	—	—	—	—	x8.10		11

Special attack	Player Buff		Target Debuff	Duration
	+5	+6	+5-6
Nightmare	+1  +1  +1	+1  +1  +1  +1	-1  -1  -1	2 turns

Nightmare EX is a special attack that targets a single enemy. It costs 7 special attack gauges to perform. It fills 4 special attack gauges.

Special attack	Rarity	Base	•	••	•••	••••	•••••		Hits
Nightmare EX +5	6★	x6.10	x6.20	x6.30	x6.40	x6.50	x6.60		11
Nightmare EX +6	7★	—	—	—	—	—	x14.46		11

Special attack	Player Buff		Target Debuff	Duration
	+5	+6	+5-6
Nightmare EX	+7	+7  +3	—	1 turn

A different version of Nightmare EX is a special attack that targets all enemies. It costs 4 special attack gauges to perform. It ignores targets' attributes.

Special attack	Rarity	Base	•	••	•••	••••	•••••		Hits
Nightmare EX +5	6★	x4.56	x4.62	x4.68	x4.74	x4.80	x4.86		11
Nightmare EX +6	7★	—	—	—	—	—	x10.02		11

Special attack	Player Buff		Target Debuff	Duration
	+5	+6	+5-6
Nightmare EX	+100%	+3  +120%	—	1 turn

Learning Nightmare

Kingdom Hearts Union χ

• Nightmare +5 is the special attack for medal 516: Jack & Sally.
• Nightmare +6 is the special attack for medal 1238: Jack & Sally.

• Nightmare EX +5 is the special attack for medal 1017: Jack Skellington LM Ver^[JP].
• Nightmare EX +6 is the special attack for medal 1483: Jack Skellington LM Ver^[JP].

• Nightmare EX +5 is the special attack for medals 1565: Prime - Halloween Sora^[EN] and 1641: <Pr> Jack & Zero^[JP].
• Nightmare EX +6 is the special attack for medals 1566: Prime - Halloween Sora^[EN] and 1642: <Pr> Jack & Zero^[JP].

Notes and references

• Kingdom Hearts Union χ special attacks