User blog comment:Krufix/Dazzle - The Shadow Priest (Dota crossover champ)/@comment-6061249-20140131223536/@comment-4636093-20140201094817

When they do get to -100 it really won't make much difference because the teamfight will be long over. The long duration is primarily there to force action from the enemy. If they're in a siege and get hit by it then they need to make the decision to back off or engage now while their armor is still high.

I was thinking about making the duration higher and the armor per second lower but then it'll have a really short downtime especially with 40% CDR.1