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Drain Psyche you need to be near the enemy for each "tick" as you drain them.
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i might be misunderstanding what you are saying, but to clarify: You need to be near the enemy when you *activate* Drain Psyche. For each mob it hits you gain a bonus to both your endurance and hitpoint recovery. The bonus lasts about 30 seconds and you don't have to remain close to the enemy for that time - they can even be defeated, you still get the full bonus for the 30 seconds.
Personally I didn't bother with Spirit Tree as it doesn't mesh well with my dynamic highly mobile playstyle, and Drain Psyche gives vastly superior health regen anyway if you hit enough mobs and/or slot it for heals (I slot it for recharge/endurance as that is more important to me). It's never going to help you a great deal in PvP though (especially as it can't currently be slotted for accuracy).
