I thought I would post this because I have a somewhat unique Healer build, that is extremely effective when my teammates know how to use me, but almost useless when they dont.
Im a Necromancer/Monk with attributes in Blood Magic, Soul Reaping, and Healing Prayers. There are 2 key things that most groups dont do effectively and blame usually falls on me.
1. Focused Fire, calling targets. As a necromancer primary, I have access to far more Energy than a Monk thanks to Soul Reaping. I gain energy to heal your ass every time a target goes down. Calling targets and taking them down one at a time will keep me with plenty of energy to heal everyone. Im continually amazed at how many (ascended) groups still prefer to pick a target and attack it regardless of what their team is doing. This hurts the group more than many of you know.
2. Pull targets to Well of Blood. I find myself often vigorously healing teammates when there is a +5 health regeneration Well 10 feet away from where our melee is fighting 6 mobs. PULL THEM TO THE WELL. It will make you extremely hard to kill, and when the Well expires there will likely be a new corpse at your feet for me to expoit into another Well. That big flashing circle is pretty hard to miss.
With groups that understand and implement this I do excellent as a Primary healer. While somewhat unorthodox I will typically start battles by Life Siphoning 3 or so mobs to get my health regen disgustingly high, then go nuts with Infuse Health. This works even better when im standing in a Well of Blood as I can Infuse people at will without worrying about my own health. Infusing tanks for 118% of my health is huge.
Im sure there are similarly unique healers such as Me/Mo etc. that require different strategies to work with than your typical Healing/Protection monk. If your healing build requires your team to work a little differently please tell us about it.
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AND you can cast healing/res faster.