Universal Dice Rules
Section 24 of 608
Natural 1s and 2s always fail. Natural 10s are Critical Hits.
The Rule
Natural rolls of 1 and 2 always fail. Natural rolls of 10 are Critical Hits. Critical Hits cannot be Dodged, still affect Shields, apply all normal weapon effects, and may gain additional effects from the weapon's Type or other in-game occurrences, such as Explosions, Boarding, Leadership rolls, and Ramming, to name a few.
Explanation
Fabled Star is a d10 system. Because 1s and 2s auto-fail, no amount of modifiers ever makes an attack certain, and because 10s always crit, no target is ever completely safe.
Example
A BS 4+ unit rolling 2, 4, 10, 1 scores one normal hit and one Critical Hit; the 2 and 1 auto-fail.
Designer Commentary
Auto-fail and auto-crit bookends keep swing in every roll without needing a separate confirmation step.