New Dark Spell

Arctic Blast

What it does: slows down enemy towers. Much like how poison only hurts troops (lightning hurts both troops and buildings), haste only makes troops faster. Quake damages walls/buildings.

Arctic Blast would slow the fire rate of towers to allow your troops to move closer and deal more damage to them. Cost would be whatever SuperCell decides, and the duration would be longer than freeze spell, but I was thinking of 10-15 secs for level 1. Available at th9. Each level up adds 5 secs.

Thanks,

What would be the statistic of the slow be, exactly?