https://www.reddit.com/r/FFRecordKeeper/comments/60qcm5/nightmare_abilities_balance_changes_details/
Nightmare ability changes:
Ultima
Number of hits: 2 -> 3
Multiplier per hit: 5.25 -> 4.00
Total multiplier: 10.50 -> 12.00
SB point: 65 -> 70
Neo Bahamut
Number of hits: 3 -> 4
Multiplier per hit: 6.00 -> 4.80
Total multiplier: 18.00 -> 19.20
Dervish
Number of hits: 2 -> 8
Multiplier per hit: 1.80/2.20 -> 0.48/0.60 (without/with Haste)
Total multiplier: 3.60/4.40 -> 3.84/4.80 (without/with Haste)
Target method: Single -> Single enemy
Omega Drive
Target method: Single -> Single enemy
Old formula: (1+min((1/(1+exp(-ATK/1000*4.20))*2-1)*4.00;3.87))*0.27
New formula: (1+min((1/(1+exp(-ATK/1000*3.95))*2-1)*4.30;4.26))*0.27
Nightmare ability changes:
Ultima
Number of hits: 2 -> 3
Multiplier per hit: 5.25 -> 4.00
Total multiplier: 10.50 -> 12.00
SB point: 65 -> 70
Neo Bahamut
Number of hits: 3 -> 4
Multiplier per hit: 6.00 -> 4.80
Total multiplier: 18.00 -> 19.20
Dervish
Number of hits: 2 -> 8
Multiplier per hit: 1.80/2.20 -> 0.48/0.60 (without/with Haste)
Total multiplier: 3.60/4.40 -> 3.84/4.80 (without/with Haste)
Target method: Single -> Single enemy
Omega Drive
Target method: Single -> Single enemy
Old formula: (1+min((1/(1+exp(-ATK/1000*4.20))*2-1)*4.00;3.87))*0.27
New formula: (1+min((1/(1+exp(-ATK/1000*3.95))*2-1)*4.30;4.26))*0.27