Website and data research by 101Leafy.
Mem Aleph
メムアレフ LV 76
Mother
LV 76HP 7500MP 9999
- St
- 65
- Ma
- 65
- Vi
- 65
- Ag
- 60
- Lu
- 65
Weak
Almighty x1.05
Resists
Gun null, 
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 814000, Macca 30000
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
Great Flood
MP0Power300Accuracy100
Disaster Cycle
MP: 0. Light Almighty damage, all foes. Inflicts status ailments.
MP0Power125Accuracy100Chance5%
Reason's Start
MP0Heals500
Light
MP0Accuracy120Chance70%
Darkness
MP0Accuracy120Chance70%
Mother's Kiss
MP0Power100Accuracy100Hits3-0
Fire
MP0Power350Accuracy120
Ice
MP0Power350Accuracy120
Lightning
MP0Power350Accuracy120
Wind
MP0Power350Accuracy120
Asura Roga
MP: 0. Inflicts Fly status, all foes.
MP0Accuracy100Chance25%
Light of Order
MP: 0. Instantly kill if certain conditions are met, single foe.
MP0Accuracy0Chance100%
Fights
Place Horologium B9F
Mission Horologium's Exotic Matter
Place Antlia 1F
Mission Mysterious device
Planning notes
The staff boss list (dated 7/16) has 地球意思メムアレフ (race 神霊) as the last boss of the L and N routes, with a note asking whether she changes per route.
Atlus staff planning sheet, reprinted in MEGATEN MANIACS (Shin Megami Tensei 25th anniversary book), p. 132
The staff setting sheet has メムアレフ as the 1st choice name for the working name 地球意思テラ.
Atlus staff planning sheet, reprinted in MEGATEN MANIACS (Shin Megami Tensei 25th anniversary book), p. 128