If you are not level 36 yet, maxing sonic boom will help you blow through SY2 XP runs when combined with transference and the pain AOE. Just cast pain one one mob then auto target someone else and once it blows, cast transference and sonic boom. That should finish off the majority of mobs within range. I also agree with LeLouchX as I level my Op in Sloucho PUG runs, and with Kahlua about the DoT skills being useful in SY5 against the stronger mobs and the boss man. So, the point is put the points somewhere between sonic boom and wither/leech. Hope that helps.