Defeating every Lv100 NPC (including Hell Duos) Fast and Kinda Safe Octopath COTC (F2P)

Credit to Advancer64 for the idea:    • (Overworld) Level 100 NPC Marathon! -...  
Credit to cotc_grind for the berekin npc strategy:    • Octopath COTC F2P Defeating Berecain ...  

No allies used against overworld NPCs but are used against Hell Duos

Timestamps:
Muttering Codger (Flamesgrace NPC, 3 turns): 0:00
Old Storyteller (Victor's Hollow NPC, 3 turns): 1:32
Doddering Mercenary (Donescu NPC, 3 turns): 3:25
Taciturn Housewife (Sufrataljah NPC, 3 turns): 5:15
Adventurer (Bravely Default NPC, 3 turns): 6:43
Sea Gazing Graybeard (Grandport NPC, 4 turns): 8:27
Once Famous Actress (Atlasdam NPC, 4 turns): 10:51
Bladed Wings Master (I'cirlo NPC, 5 turns): 12:58
Berecain Village Chief (Berecain NPC, 7 turns): 16:42
Hardy Dual and Dagger Wielder (Hell Cragspear Duo, 12 turns): 21:06
Guardians of Valore (Hell Valore Duo, 12 turns): 30:17