Bring existing adventurers into the mouse world—and, if they survive, home again.

A complete OSRIC guide for bringing existing adventurers into Portal Lake, surviving the mouse-world, and finding a way home.

Mice of Legend is a complete campaign setting where existing adventurers are transformed into mice and drawn into the perilous world of Portal Lake. If they are lucky, they may survive long enough to recover the legendary Stellar Keystone and find their way home again.

Everyday creatures become legendary threats. A cat is a terror. An owl haunts the night skies like a dragon. A river becomes a major expedition. Survival depends on ingenuity, exploration, and old-school problem solving rather than brute force.

A Fully Supported Campaign World

The Mice of Legend line includes a complete eight-module campaign, hundreds of pages of adventures and setting material, over 250 original illustrations, dozens of maps including high-resolution VTT-ready versions, and supplemental products including a pantheon, micro-dungeons, conversion guides, and campaign resources.

What Is Included?

Complete setting guide for the lands surrounding Portal Lake.

Animal-to-monster conversion tables.
Rules guidance for adventuring as mouse-sized heroes.

New monsters, magic items, spells, factions, NPCs, and setting lore.

Support for both campaign play and stand-alone adventures.

The Perils of Portal Lake Campaign

The campaign begins when the Stellar Keystone, a powerful relic capable of opening portals between worlds, is stolen from the human realm and carried into the mouse world.

To recover it, the party must journey across the lands surrounding Portal Lake, exploring villages, towns, mines, wilderness frontiers, ancient ruins, pirate strongholds, and forgotten places filled with danger and mystery.

As the campaign unfolds, the heroes uncover a growing threat that endangers both worlds, culminating in a final confrontation where the fate of Portal Lake—and their own return home—hangs in the balance.

Not Just a Mouse Campaign

Every creature in Mice of Legend includes a traditional fantasy equivalent, allowing Referees to run the setting either as a mouse-sized campaign or as a conventional fantasy world using standard adventurers and monsters.

Whether used as a complete campaign, a source of adventures, or inspiration for your own setting, Mice of Legend offers a unique blend of exploration, folklore, meaningful choices, memorable characters, and classic old-school play.


Released: 31 July 2026