Righteous Vengeance is a Tier 10 Retribution talent which places a stacking dot on the target based on critical strike damage dealt by the Paladin's [Divine Storm] and Judgement Spells.
Rank table
Rank
Additional Damage Dealt
1
8%
2
16%
3
24%
4
32%
5
40%
Notes
The current belief for this spell is that it will refresh the duration of the debuff, and increase the periodic damage dealt to the target based on the crit damage dealt. eg:
A Judgement crit for 1000 damage puts an 8 second dubuff of 400 damage on the target ticking for 100 damage every 2 seconds, then a Divine Storm critical strike 4 seconds later also for 1000 damage will refresh the debuff duration to 8 seconds, and will add the 400 damage to the 200 still left in the pot, and will therefore tick for 150 damage until the buff expires or another critical strike refreshes the stack. (Please confirm or dismiss this as this is my understanding)