It has a chance (around 15% for ele) to duplicate a harmful spell. Which makes it kinda insane for elemental shamans (the mastery of ele is basically the same, a chance to proc a 2nd version of lava burst, chain l or light bolt, for free at 75% of the damage). So in theory you can have 1 lava burst go off 5 times in 1 GCD. There are various ele shaman mechanics that make it even more interesting, if the staff duplicates cl, lvb or lb ele can gain extra stacks of lightning shield orbs as well).
It's basically running around like rambo in bg's. The weirdest I've had was casting a lava burst, mastery procs and staff procs, and at the same time lava surge (a talent) resets cooldown on Lava Burst, after wich I use elemental mastery to fie an instant lava burst that procs mastery, got a full stack of lightning shield and it crits again. Which was 230k dmg in about 2,5 seconds.
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