Aberration
Aboleth
Aberration
Huge
very rare
 
Beast
Boiuna
Beast
Gargantuan
very rare
 
Elemental
Water Wisp
Elemental
Tiny
rare
 
Fey
Nereid
Fey
Medium
biped... and how!
very rare
 
Magical Beast
Water Orm
Magical Beast
Huge
serpentine
very rare
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lake, tropical, aphotic