CR 11–16 fiend creatures from Monster Labs. These public stat blocks fit that band of the table; remix the CR or abilities if your party is ahead of the curve.
Infernal Pyromancer
CR 16 · Fiend
He Shen
CR 15 · Fiend
Zaroth the Eternal
CR 15 · Fiend
The Guide of the Unclean
CR 15 · Fiend
Odio
CR 15 · Fiend
Mystical Space Hitler
CR 15 · Fiend
Lord of Dark
CR 15 · Fiend
Odio, the Lord of Dark
CR 15 · Fiend
Eldritch Patron
CR 15 · Fiend
Zalcano
CR 15 · Fiend
King of Curses, Sukuna
CR 15 · Fiend
Magus, the Mystic Fiend Lord
CR 15 · Fiend
Haborym
CR 15 · Fiend
Viviann the Futanari Queen
CR 15 · Fiend
Lilith, the Succubus Goddess
CR 15 · Fiend
Oneiroi, the Dream Weaver
CR 15 · Fiend
Harbinger of Qailith
CR 15 · Fiend
The King in Yellow
CR 15 · Fiend
Ulquiorra Cifer
CR 15 · Fiend
Lord of Darkness
CR 15 · Fiend
Gorlock the Destroyer
CR 15 · Fiend
Lustful Temptress
CR 14 · Fiend