Quote Originally Posted by Zenmaku View Post
...Phlebotomize...
It's all about maximizing your damage per GCD, TP expense, and situation. In order for you to get more than Phlebotomize's damage output, you'd have to insert two more True Thrusts rather than one (as you're already going to use one for your basic damage combo anyway). A full Phlebotomize is 290 potency (18/3=6*20=120+170) whereas two True Thrusts are 300 (150*2). The TP cost is 90, compared to 140 (70*2). It consumes half the GCD, thus enabling a cleaner rotation. It continues dealing damage even if you have to be out of range to avoid an attack or hit another enemy. Each tick (3 secs) has its individual critical chance making it deal potentially more than two True Thrusts.

DoTs are incredibly powerful when used to their fullest.