Lich

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

Pathfinder 2e Bestiary 1     Pathfinder original/official source

Undead Revisited     Pathfinder original/official source

Book Of Beasts: Legendary Foes     Pathfinder original/official source

Mythic Adventures     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Flee, Mortals     D&D 5e (no source link)

Monsters Of The Underworld     D&D 5e original/official source

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

Monster Manual     D&D 4e (no source link)

Dungeons And Dragons Essentials: Monster Vault     D&D 4e (no source link)

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

D&D 2e Monstrous Manual     D&D 2e (no source link)

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

AD&D Monster Manual     AD&D 1e (no source link)

13th Age Bestiary     13th Age original/official source

Dragonlance Bestiary     SAGA (no source link)

Monster Guide     World Of Warcraft RPG original/official source

Beyond The Black Sea Bestiary     Beyond The Black Sea (Dark Stars) original/official source

The Monster Overhaul     OSR (no source link)

Iron Falcon Handbook Of Monsters     OSR (no source link)