Hi, so we have checked and looked into this skill. It is working properly, the mechanics of it just changed a little. There is only a 2% chance to trigger the Baleful Recharge buff, and once you have triggered this buff, every enemy you fear will gain you exploitation stacks.
If you need this buff for mana regeneration while grinding PVE monsters I would advise you to use the Auramancy Skilltree instead and go for Mediate.