It's a RNG 12 AOE 5 attack. You target a model. If you hit, center a 5" AOE on the model. If you miss, it deviates as any other AOE attack, and you center a 5" AOE on where ever the attack deviates to. Either way, the AOE stays in play for 1 round, and while within the AOE models do not benefit from the listed abilities.
