Bodyguard.
1. As i know. People don't want see Merc healer in their RWZ team.(I prefer PvP than PvE) For heat reason. unmobility.
2. I like Healer merc. Good solo target healer. but no good for group(overheat to fast).
If i stay at def point(stupid group, they don't need healer:D). i can do easly def point and /ops Ind <point> for a long time.