- January 6, 2026
- Castle Oldskull
OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex
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OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex is a single player role playing game. It was developed by Castle Oldskull and was released on January 6, 2026.
Celebrating over 50 years of fantasy adventure role-playing in the Gygaxian and Arnesonian tradition, the OLDSKULL GRAND BESTIARY: IMPERIOUS OVERLORD’S CODEX unifies the ultimate fantasy game’s Advanced, Basic, and Expert monster systems into a single concordance, perfect for your Advanced, B/X, Original, Shadow, Old School, or Fifth Edition campaign. The Codex has been written for the clas…
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Frequently Asked Questions
OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex is a role playing game.
OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex was released on January 6, 2026.
OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex was developed by Castle Oldskull.
OLDSKULL GRAND BESTIARY - Imperious Overlord's Codex is a single player game.
Similar games include Castle Oldskull Module 15: Warriors, Castle Oldskull Module 14: Oldskull Knights, Castle Oldskull Module 1: The Classic Dungeon Design Guide I, Castle Oldskull Module 7: Oldskull Monster Generator, Castle Oldskull Module 2: The Classic Dungeon Design Guide II and others.