Work in progress, will edit as I find more notes, get feedback, and we explore more.
Nightmare Antlion (Tavnazia):
Mandible Bite - ST damage
Pit Ambush - heavy ST damage (on aggro)
Sandblast - AoE Blind, Silence
Venom Spray - LoS Venom (-50HP/3s)
AF -1 Drops: none
Relic Drops: none
Notes: Spawns Tavnazia 3rd floor, required to unlock subjobs, time extension
Nightmare Bugard (Tavnazia):
Awful Eye - LoS STR Down (STR-?), Petrify
Bone Crunch - ST damage, Plague
Heavy Bellow - AoE Stun
Scutum - Defense Bonus
Tail Roll - LoS damage
AF -1 Drops: none
Relic Drops: none
Notes: Spawns Tavnazia 1st floor (Phomiuna Aqueducts), time extension
Nightmare Bunny (Buburimu):
Dust Cloud - LoS damage, Blind
Foot Kick - ST damage (critical?)
Whirl Claws - AoE damage (LARGE range, up to 3 shadows, very heavy damage)
Wild Carrot - self Cure (varies with current HP)
AF -1 Drops: Hands - THF
Relic Drops: Belt - NIN
Notes: Spawns after boss death, south/west of outpost
Nightmare Cluster (Tavnazia):
AF -1 Drops:
Relic Drops:
Notes:
Nightmare Cockatrice (Buburimu):
Baleful Gaze - LoS Petrify
Poison Pick - ST Poison (-5HP/3s)
Sound Blast - AoE INT Down (INT-20, diminishes)
Sound Vacuum - AoE Mute (~35s, can't remove with Echo Drops/Silena)
AF -1 Drops:
Relic Drops:
Notes: Spawns after boss death, NW Shakrami zone
Nightmare Crab (Buburimu):
Bubble Curtain - Magic Defense Bonus
Bubble Shower - AoE STR Down (STR-15, diminishes)
Big Scissors - ST damage
Scissor Guard - Protect
AF -1 Drops: Hands - RDM
Relic Drops: Belt - DRG
Notes: Spawns after boss death, south beach area
Nightmare Crawler (Buburimu):
Cocoon - Defense Bonus
Poison Breath - LoS Poison (-5HP/3s)
Sticky Thread - LoS Slow (overwrites Haste)
AF -1 Drops:
Relic Drops: Cape - DRK
Notes: Spawns after boss death, east cliff areas
Nightmare Dhalmel (Buburimu):
Berserk - self Berserk (ATK Boost, DEF Down)
Cold Stare - LoS Silence
Healing Breeze - self AoE Curaga (sizable range, can wake up surrounding enemies)
Sonic Wave - LoS DEF Down (-?%DEF)
Stomping - ST damage
Whistle - self AoE AGI Boost
AF -1 Drops:
Relic Drops: Belt - WAR
Notes: Spawns after boss death, north area
Nightmare Diremite (Qufim):
Double Claw - ST damage
Filamented Hold - LoS Slow (overwrites Haste)
Grapple - ST damage
Spinning Top - Heavy AoE damage (up to 3 shadows)
AF -1 Drops: Feet - NIN
Relic Drops:
Notes: Spawns after boss death, north cave area
Nightmare Eft (Buburimu):
Geist Wall - AoE Dispelga (1-3 buffs)
Numbing Noise - AoE Stun (~5s)
Toxic Spit - ST Poison (-20HP/3s)
AF -1 Drops: Hands - RNG, SAM, SMN
Relic Drops: Cape - PLD
Notes: Spawns after boss death, southwest of outpost, low magic resistance?
Nightmare Fly (Valkurm):
Cursed Sphere - heavy AoE damage
Debilitating Drone - AoE stat down (random, 2-5 stats)
Somersault - ST damage, Stun?
Venom - LoS Venom (-50HP/3s)
AF -1 Drops: none
Relic Drops: none
Notes: Spawns 3 areas, required to unlock subjobs
Nightmare Gaylas (Qufim):
AF -1 Drops:
Relic Drops:
Notes:
Nightmare Hippogryph (Valkurm):
Choke Breath - LoS Silence/Paralyze (can be absorbed, up to 2? shadows)
Fantod - Boost
Hoof Volley - ST damage, Knockback
Jettatura - LoS terror
Nihility Song - AoE Dispelga (including food)
AF -1 Drops:
Relic Drops: Belt - BST
Notes: Spawns at start, west beach area / Gustav zone / Selbina zone (post boss)
Nightmare Hornet (Tavnazia):
Frenzy Pollen - Hundred Fists
Sharp Sting - ST damage
AF -1 Drops: Legs - RDM, RNG
Relic Drops:
Notes: Spawns at start, tunnel areas
Nightmare Leech (Tavnazia):
AF -1 Drops:
Relic Drops:
Notes: Spawns at start, ramps to lower waterways
Nightmare Kraken (Qufim):
AF -1 Drops:
Relic Drops:
Notes: Spawns after boss death, southwest coast area (near Nightflowers)
Nightmare Mandragora (Buburimu):
Dream Flower - AoE Sleep (cannot remove with Poison/Venom)
Head Butt - ST damage (critical?)
Leaf Dagger - ST damage, Poison (-?HP/3s)
Scream - AoE MND Down (MND-20, diminishes), Terror (~5s)
Wild Oats - ST damage, VIT Down (-?VIT)
AF -1 Drops: Hands - BLM, MNK, WAR
Relic Drops:
Notes: Spawns after boss death, north area
Nightmare Makara (Tavnazia):
AF -1 Drops:
Relic Drops:
Notes: Spawns at start, waterway areas
Nightmare Manticore (Valkurm):
Deadly Hold - ST damage
Heat Breath - LoS fire damage
Riddle - AoE Max MP Down
Tail Swing - ST damage, Bind
AF -1 Drops: RDM Head
Relic Drops: BLM
Notes: Spawns at start, eastern beach area, Konschtat zone
Nightmare Morbol (Valkurm):
Bad Breath - LoS Bind/Blind/Gravity/Paralyze/Poison/Silence
Impale - ST damage, Bind
Sweet Breath - LoS Sleep
Vampiric Lash - ST Drain
AF -1 Drops: none
Relic Drops: none
Notes: Spawns after boss engaged (as 2 pets summoned by Cirrate Christelle), do not despawn automatically after boss killed
Nightmare Raven (Buburimu):
Damnation Dive - LoS damage, Stun
Blindside Barrage - LoS damage
Broadside Barrage - LoS damage
Helldive - LoS (?) damage
Wing Cutter - LoS wind damage (through shadows)
AF -1 Drops:
Relic Drops: Belt - RNG
Notes: Spawns after boss death, eastern hill area
Nightmare Raptor (Qufim):
Chomp Rush - ST damage, Slow
Foul Breath - LoS fire damage, Virus
Frost Breath - LoS ice damage, Paralyze
Ripper Fang - ST damage, Poison (?)
Scythe Tail - LoS (?) damage, knockback
Thunderbolt - LoS thunder damage
AF -1 Drops:
Relic Drops:
Notes: Spawns after boss death, east of lake area
Nightmare Roc (Qufim):
Blind Vortex - ST damage, Blind
Feather Barrier - Evasion Boost
Giga Scream - ST damage, triple attack
Gliding Spike - ST damage
Stormwind - AoE wind damage, Silence
AF -1 Drops:
Relic Drops:
Notes: Spawns at start, tunnel entrances
Nightmare Sabotender (Valkurm):
1000 Needles - AoE damage
2000 Needles - AoE damage
4000 Needles - AoE damage
10000 Needles - AoE damage (only used by "main" sabotender as special)
Needleshot - ST damage
Regeneration - Regen
AF -1 Drops: Head - DRG, WAR
Relic Drops: Cape - NIN, PLD
Notes: Spawns at start, outpost east/oasis and Konschtat zone areas
Nightmare Scorpion (Buburimu):
Critical Bite - ST critical damage
Earthbreaker - huge AoE damage, Stun
Evasion - Evasion Boost
Stasis - ST Paralyze
Venom Breath - LoS Venom (-50HP/3s)
Venom Sting - ST Venom (-100HP/3s)
Venom Storm - AoE damage, Venom (-20HP/3s)
AF -1 Drops:
Relic Drops:
Notes: Spawns after boss death, east cliff areas
Nightmare Sheep (Valkurm):
Sheep Bleat - AoE Slow (does not overwrite Haste)
Sheep Charge - ST damage (critical?)
Sheep Song - AoE Sleep (wears with Poison/Venom, can be avoided with vertical distance)
AF -1 Drops: Head - BRD, DRK, RNG
Relic Drops: Belt - BLM, WHM; Cape - THF
Notes: Spawns at start, oasis east (hills) areas, regenerates TP while asleep
Nightmare Snoll (Qufim):
Cold Wave - AoE Frost (AGI -43)
Freeze Rush - ST damage
Frost - ST Frost
Hypothermal Combustion - AoE damage
AF -1 Drops:
Relic Drops: Belt - RNG
Notes: Spawns at start, Delkfutt's west and N/S tunnel areas
Nightmare Stirge (Qufim):
Blood Drain - ST Drain
Subsonics - AoE DEF Down (DEF -?%)
Marrow Drain - ST Aspir
Ultrasonics - AoE Evasion Down
AF -1 Drops:
Relic Drops:
Notes: Spawns at start, passage areas from lake
Nightmare Taurus (Tavnazia):
AF -1 Drops:
Relic Drops: Hydra armor pieces
Notes: Spawns from Nightmare Eyes with Kindred, 3rd floor
Nightmare Tiger (Qufim):
Claw Cyclone - LoS damage
Crossthrash - LoS damage
Predatory Glare - LoS Stun
Razor Fang - ST (?) damage
Roar - AoE Paralyze
AF -1 Drops:
Relic Drops:
Notes: Spawns after boss death, Delkfutt's south
Nightmare Uragnite (Buburimu):
Gas Shell - AoE Venom/Plague (-?HP/3s, -3MP/3s, -?TP/3s)
Venom Shell - AoE Gravity/Venom (-20HP/3s?)
Palsynyxis - ST Paralyze
Suctorial Tentacle - ST Bind
AF -1 Drops: Hands - PLD
Relic Drops:
Notes: Spawns after boss death, east beach areas, massively links...
Nightmare Weapon (Qufim):
Flurry of Rage - ST damage
Smite of Rage - ST damage
Whirl of Rage - AoE damage, Silence/Gravity
Whispers of Ire - AoE stat drain (random, 2-5 stats)
AF -1 Drops:
Relic Drops: Belt - DRG
Notes: Spawns after boss death, Delkfutt's south (cermet ridge)
Nightmare Worm (Tavnazia):
Draw In (all alliance members, active or KO'd)
Sound Vacuum - AoE Silence
Stone V, Stonega IV
Tremors - heavy AoE damage, DEX Down (DEX-?, diminishes)
AF -1 Drops: none
Relic Drops: none
Notes: Spawns Tavnazia 2nd floor, required to unlock subjobs