Righteous Fury

Normally, when you hit with an attack, the resulting Damage includes rolling one or more d10s. When you roll a 10 on any die, it may indicate that the eye of the Emperor is upon you. This calls for a second attack roll, Testing Weapon Skill or Ballistic Skill with the same target number as if you were making another attack. If this second Test is successful You can roll an additional 1d10 and add the result to the Damage total.
Should the result of this die also be a 10 you may immediately roll a third 1d10 and add that to the Damage total as well. This process continues until you roll a number other than 10.

When using a 1d5 for damage, on a roll of 5 roll a 1d2. on a roll of 1 Righteous Fury is not triggered. on a roll of 2 it is triggered.