The main problem is that Shadowbond has a cooldown equal to its duration, so you can only ever heal one person every 24 seconds; and it's 125 HP every 6 seconds, so while it will generally sustain a tank through a steady, easy XP grind, it can't save anybody's life if they're in trouble. The moment anything goes wrong, the necro healer concept falls apart completely. Being limited to 20 healing per second on one target at a time is only viable if it's a strong group effortlessly grinding low blues. Anything remotely tough and it won't cut it.
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