User blog comment:RoznosicielCiast/CCC5 - Yngaire, the Queen of Thieves/@comment-3974211-20140909132742/@comment-6061249-20140909172316

Every time a spell is casted, Mirrorize casts the exactly same (or modified, some spells need to be modified) in opposite direction. That seems simple, i don't know what can be misunderstood there.

You don't need to hit with both parts of one ability. You can hit with, for example, original E, and then with mirrored Q, and the damage will be triggered. I wanted to make some unique combo mechanics on her. Seems like didn't turn out to be as good as i thought.

And holy moly, it's true damage that can be dealt multiple times to same target, it's already powerful, even if it's passive.