What if you crit on an already active divine aegis ? Will it overwrite the previous one or will they both be applied ? Also seeing as it's not the same shield as pw:shield I assume it will not overwrite it ?
SO if you proc an aegis for 1000 of mitigation, then you proc a second for another 1000, and the tank has taken 500 damage between the two procs you have 1500 left on your proc.