The code for the blessing has been in the game for quite a long time. Based on the code the blessing applies up to 4 stacks of rending and the cap is 20 stacks for 20% rending in total. The rending debuff is not based on how many stacks of soulblaze or burn the enemy has, but rather it’s an independent debuff that applies on hit. The numbers may be adjusted in the patch but I personally don’t think they will be.
