Undoubtedly the most powerful and demanding acid  attack spell known, is the
spell acid storm. Similar to the spell acid rain, this spell affects a group
of targets with acid damage, but the similarities stop there. Instead of
raining acid, this spell  creates acid that envelopes the target and swirls 
around it for a few seconds. The intensity is remarkable. It also takes
tremendous amount of concentration and effort is needed to activate this
spell.