Mechanics overview
Mothership 1E dice rules
Roll Mothership 1E dice online for free. Our percentile dice roller handles d100 roll-under skill checks, fixed 00/99 critical successes and failures, doubles as criticals, panic checks with stress tracking, and the advantage/disadvantage system. Perfect for sci-fi horror survival.
Quick rules summary
Roll d100 (00-99) against your skill value. Roll under to succeed. 00 is always a critical success and 99 always a critical failure, regardless of your skill. Any other doubles (11, 22, 33, and so on) are also criticals: doubles that beat your skill critically succeed, and doubles that don't critically fail. Advantage lets you roll twice and keep the better result; disadvantage keeps the worse.