Website and data research by 101Leafy.
Ouroboros
ウロボロス LV 43
Snake
LV 43HP 2300MP 9999
- St
- 30
- Ma
- 33
- Vi
- 34
- Ag
- 30
- Lu
- 34
Weak
Fire x1.25, 
Almighty x1.05
Resists
Physical x0.5, 
Gun x0.5, 
Electric drain, 
Expel null, 
Curse null
AilmentsSleep null, Poison x0.1, Paralyze x0.01, Charm x0.01, Mute null, Stone null, Fear x0.1, Strain null, Bomb null, Fly null
RewardsEXP 127000, Macca 0
Compendium demonOuroboros
101Leafy researched the game for these numbers. They are the boss's own and can differ from a compendium demon with the same name.
Skills
Auto-Recover
Recover HP each turn.
Passive
Disaster Cycle
MP: 0. Light Almighty damage, all foes. Inflicts status ailments.
MP0Power125Accuracy100Chance5%
Wild Lightning
MP: 0. Heavy Electric damage, all foes.
MP0Power150Accuracy100
Fights
Place Eridanus TOP
Place Antlia 1F
Mission Mysterious device
Planning notes
The staff boss list (dated 7/16) has Ouroboros as the fifth area's boss. Its notes ask whether to change it to a demon such as Miriam, so every late area boss would share the "MA" sound. No "MA" demon fit a boss that "runs" its area, and new art cost money, so the note leans toward keeping Ouroboros. It stayed.
Atlus staff planning sheet, reprinted in MEGATEN MANIACS (Shin Megami Tensei 25th anniversary book), p. 132