The elementals blast seems to hit -some- mobs that wander around but nearly no mobs that are stationary. I can only guess it's something to do with the fact they wander. The fire elementals attack will only hit mobs your fighting too.
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<br>I think the main reason for this was something many of us were doing back when it first came out - the fire and air elementals are immune to some attacks, and it wasn't hard to find one of these mobs and get the elemental to tank it. Kinda like the zombies and poison problem we had.
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<br>Yhorian