Shin Megami Tensei V: Vengeance - Godborn Demi Fiend, Hard, No DLC, Minimal RNG

No turn for you, Demi-Fiend.

Demi-Fiend's HP: 85136
Starting lineup Phys Null eliminates Javelin Rain seal and stat investment except for Gogmagog (529 STR for enough minimum damage), Taunt removes Demi-Fiend's turn, Beelzebub and Inflaming Divinity for full buffs and debuffs. Helmsman minimizes Figment Slash missing, making it the only RNG for the fight.

Teams and skills needed:
Nahobino - Null/Repel/Drain Phys, Inflaming Divinity
Beelzebub - Debilitate, Null/Repel/Drain Phys
Gogmagog - Figment Slash build, 529 STR minimum
Arahabaki - Impaler's Animus or Horus with Null Phys
Mother Harlot - Fierce Roar/Taunt or Girimekhala (Repel/Drain Phys demon that is not Lady, Megami, Herald, or Femme)
Xiezhai
Any Neutral-Neutral demon for Omagatoki: Strategize

Turn 1:
Demi Fiend's Javelin Rain nulled by the starting lineup

Beelzebub - Debilitate
Nahobino - Switches in Mother Harlot
Arahabaki - Impaler's Animus
Mother Harlot - Fierce Roar
Beelzebub switches to strategize demon
Nahobino - Inflaming Divinity

Turn 2:
Demi Fiend's Deadly Fury Repelled

Omagatoki: Strategize
Figment Slash until Demi-Fiend is dead (10642 damage min with 8 press turns)