Zilean Bombs work like magic =D Sure it's a reduced dmg, but 2-3 lvl5 bombs can destroy the turrets in an instant.
kathus lay waste and defile both work but like others have said they both suffer greatly reduced damage
Soraka's AE does practically nothing due to reduced damage.
Sivir's bouncing blades destroy them pretty hard
Morganas, Nasus, veigar, cryophoenix... aoe totaly rape my turret farms. basically every aoe does the trick if its on a short cooldown
Cho's spikes DO damage them.
work's but not well enough is a rammus powerball into a tremors. late game even, only got the turrets down half before 5 of them killed me....
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