Its bugged. It was in patch notes and if you go in game you can see that his starting damage per second for ultimate is 50.

A wise man gets more use from his enemies than a fool from his friends.
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As it churns, it deals 50/75/100 (+25% of ability power) magic damage every second to nearby enemies for 7 seconds. The storm moves faster the closer it is to Viktor.
I think its more like this :D
I think its more like this :D

I'd rather be hated for who I am than loved for who I'm not.
Sigs made by: LaCorpse, jhoijhoi, Katoki, JEFFY40HANDS, The_Nameless_Bard and Sk1llbug
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It states that after launch it deals 40/60/80 damage every second(+24% AP), while it should 50/75/100(+25% AP).