2018 · Sourcebook (rules/options to enhance play)
Operation Unfathomable Players' Guide
A player-facing guide to the Underworld setting, featuring comics, background information, rumors, and a partial map to help prepare for the initial scenario. It adds two playable species, two character classes, new spells, unusual items, and a custom character sheet. The spells and items duplicate those found in the main adventure module.
Skill Based (buy or gain skills)Attribute/Stat Based (STR, CON, PER, etc)Level Based (Earn XP and level up)
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Free, on web, Android and iOS
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Game facts (players, playing time, age, credits) from BoardGameGeek.