VIGILATE

VIGILATE is a humble ten-page supplement for Stay Frosty that provides mechanics for playing as Roman legionaries. Typically, you'll get a good game out of it if those legionaries find themselves lost in a primeval forest or shipwrecked on some bleak barbarian shore, beset by enemies human and monstrous. 

You'll need a copy of Stay Frosty to use this book.

There's an adventure that goes with these rules: INOPS INHUMATAQUE. It's about a handful of legionaries shipwrecked on a bleak barbarian shore, hunted by a supernatural entity as they try to make their way back to the Roman settlement at Durostorum.