User blog comment:Megames1/Dota Crossover - Akasha the Queen of Pain/@comment-4636093-20130218185451

15 second 30% slow is too muuuuch. Teamfights in Dota last 5 times as long as in LoL, so soft CC has a right to be that long. But in LoL? Not a chance.

Also I think you're overdiong it with the passive. Make it only affect the base damage, as 2.0 AP ratios on all her skills after just 6 spellcasts is way too much.