CR 20: Pit fiend (18 HD), Aspect of Bel (22 HD), Bel (26 HD)
CR 21: Aspect of Belial (30 HD), Aspect of Dispater (28 HD), Aspect of Levistus (25 HD),
Aspect of Mammon (28 HD)
CR 22: Aspect of Glasya (28 HD), Geryon (30 HD), The Hag Countess (33 HD)
CR 23: Aspect of Baalzebul (30 HD)
CR 24: Aspect of Mephistopheles (30 HD), Belial (36 HD), Fierna (36 HD)
CR 25: Mammon (34 HD), Levistus (33 HD)
CR 26: Dispater (34 HD)
CR 19
Fierna: Str 27, Dex 23, Con 25, Int 26, Wis 26, Cha 37 = 164 (28 HD = 6 ability increases)
CR 20
Pit Fiend: Str 37, Dex 27, Con 27, Int 26, Wis 26, Cha 26 = 169
Aspect of Bel: Str 38, Dex 15, Con 30, Int 27, Wis 27, Cha 25 = 162 (22 HD = 4 ability increases)
Bel: Str 40, Dex 16, Con 32, Int 27, Wis 27, Cha 25 = 167 (26 HD = 5 ability increases)
CR 21
Aspect of Belial: Str 27, Dex 23, Con 25, Int 26, Wis 26, Cha 37 = 164 (30 HD = 6 ability increases)
Aspect of Dispater: Str 37, Dex 14, Con 35, Int 29, Wis 22, Cha 29 = 166 (28 HD = 6 ability increases)
Aspect of Levistus: Str 24, Dex 24, Con 29, Int 25, Wis 32, Cha 27 = 161 (25 HD = 5 ability increases)
Aspect of Mammon: Str 34, Dex 15, Con 33, Int 28, Wis 29, Cha 25 = 164 (28 HD = 6 ability increases)
CR 22
Aspect of Glasya: Str 27, Dex 34, Con 27, Int 27, Wis 28, Cha 36 = 179 (28 HD = 6 ability increases)
Geryon: Str 36, Dex 19, Con 35, Int 26, Wis 24, Cha 23 = 163 (30 HD = 6 ability increases)
Hag Countess: Str 31, Dex 26, Con 24, Int 28, Wis 31, Cha 28 = 168 (33 HD = 7 ability increases)
CR 23
Aspect of Baalzebul: Str 39, Dex 13, Con 34, Int 28, Wis 27, Cha 25 = 166 (30 HD = 6 ability increases)
CR 24
Aspect of Mephistopheles: Str 25, Dex 27, Con 26, Int 27, Wis 31, Cha 28 = 164 (30 HD = 6 ability increases)
Belial: Str 29, Dex 25, Con 27, Int 28, Wis 28, Cha 39 = 176 (36 HD = 8 ability increases)
Fierna: Str 29, Dex 25, Con 27, Int 28, Wis 28, Cha 39 = 176 (36 HD = 8 ability increases)
CR 25
Mammon: Str 36, Dex 17, Con 35, Int 30, Wis 31, Cha 27 = 176 (34 HD = 7 ability increases)
Levistus: Str 26, Dex 26, Con 31, Int 27, Wis 34, Cha 29 = 173 (33 HD = 7 ability increases)
CR 26
Dispater: Str 39, Dex 16, Con 37, Int 31, Wis 24, Cha 31 = 178 (34 HD = 7 ability increases)