User blog comment:LegoCS/Nezumy, the Clever Mouse/@comment-4636093-20131226110922/@comment-7481207-20131227112131

A note on the scalings, 0,05% on the slow is WAY too low, with 800 AP (which is what mages that build hardly no defense or utility tend to get), the slow gained from the scaling is 0,4%, which added with the base slow on max rank becomes 18,4%. Compare it with Janna's and Sona's slows, both of which has more than twice the base slow and 6% AP and 4% AP scaling respectively.

The ultimate needs to be a bit more clearer, it only lists one total damage, but there are two different situations in which it deals different damage (Normal cast and cats on an enemy affected by Pendulum Guard).