Last night I tried running void tendrils vs some melee cleaves in 3s. It wasn't bad considering the number of warriors, who are impossible to fear. My problem is the talent only works when you're being trained. In order for me to help a teammate I have to run over next to when, which put me in danger of beind CCed and if I do run over to my teammate I can't be next to the enemy healer for a fear. I think the talent would be a much better choice if it had say a 20 yard range on it. This way I could still help my team. I would also help for catching healers to put them into a fear. As the game stands now psyfiend is the only real choice for pvp.