Hidden extra creatures found in the mod's files. I will delete this discussion on Shad's request.

Feathered Rex:
Rex_character_BP_Shad_Feathered_C
blueprint'/game/mods/IceWyverns/InnerData/Rex/Rex_character_BP_Shad_Feathered.Rex_character_BP_Shad_Feathered'

Seratine Wyvern:
Wyvern_Character_BP_Seratine_C
blueprint'/game/mods/IceWyverns/InnerData/Wyvern/Seratine/Wyvern_Character_BP_Seratine.Wyvern_Character_BP_Seratine'

Wyvern_Character_BP_Seratine_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Wyvern/Seratine/Wyvern_Character_BP_Seratine_Alpha.Wyvern_Character_BP_Seratine_Alpha'

Wyvern_Character_BP_Seratine_Ghost_C
blueprint'/game/mods/IceWyverns/InnerData/Wyvern/Seratine/Wyvern_Character_BP_Seratine_Ghost.Wyvern_Character_BP_Seratine_Ghost'


Alphas:
Spino_Character_BP_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Spino/Spino_Character_BP_Shad_Alpha.Spino_Character_BP_Shad_Alpha'

Spino_Character_BP_Shad_Alpha_Crystal_C
blueprint'/game/mods/IceWyverns/InnerData/Spino/Spino_Character_BP_Shad_Alpha_Crystal.Spino_Character_BP_Shad_Alpha_Crystal'

Yutyrannus_Character_BP_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Yutyrannus/Yutyrannus_Character_BP_Shad_Alpha.Yutyrannus_Character_BP_Shad_Alpha'

Wyvern_Character_BP_Lightning_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Wyvern/Wyvern_Character_BP_Lightning_Shad_Alpha.Wyvern_Character_BP_Lightning_Shad_Alpha'

Wyvern_Character_BP_Poison_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Wyvern/Wyvern_Character_BP_Poison_Shad_Alpha.Wyvern_Character_BP_Poison_Shad_Alpha'

Rockgolem_Character_BP_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Rockgolem/Rockgolem_Character_BP_Shad_Alpha.Rockgolem_Character_BP_Shad_Alpha'

Liopleurodon_Character_BP_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Liopluerodon/Liopleurodon_Character_BP_Shad_Alpha.Liopleurodon_Character_BP_Shad_Alpha'

Dunkle_Character_BP_Shad_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Dunkle/Dunkle_Character_BP_Shad_Alpha.Dunkle_Character_BP_Shad_Alpha'

Dunkle_Character_BP_Shad_Alpha_Arcane_C
blueprint'/game/mods/IceWyverns/InnerData/Dunkle/Dunkle_Character_BP_Shad_Alpha_Arcane.Dunkle_Character_BP_Shad_Alpha_Arcane'

ShadWyvern_Character_BP_Ice_Alpha_C
blueprint'/game/mods/IceWyverns/InnerData/Icewyvern/ShadWyvern_Character_BP_Ice_Alpha.ShadWyvern_Character_BP_Ice_Alpha'