UNIQUE

Tarrasque

 

Dracopedia Bestiary: An Artist's Guide     Any original/official source

The Monsters Know What They're Doing     Dungeons And Dragons original/official source

Angry Golem (web)     D&D 5e original/official source

Pathfinder 1e Bestiary 1     Pathfinder original/official source

Mythic Monster Manual v1     Pathfinder original/official source

All Sorts Of Critters (web)     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Monster Ecology Anthology     D&D 5e (no source link)

Dragon Magazine     D&D 2e/3e (no source link)

MojoBob (web)     D&D 2e original/official source

D&D 2e Monstrous Manual     D&D 2e original/official source

Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)

13th Age Bestiary     13th Age original/official source

Fantasy Bestiary     GURPS (no source link)

Baby Bestiary 2     Any original/official source