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.

Don't hate, it's too big a burden to bear.
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Well, hope I didn't screw it up; so it's
As it churns, it deals {50/75/100} {+0.25% AP} magic damage every second to nearby enemies for 7 seconds. The storm moves faster the closer it is to Viktor.
Right?
As it churns, it deals {50/75/100} {+0.25% AP} magic damage every second to nearby enemies for 7 seconds. The storm moves faster the closer it is to Viktor.
Right?
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

A wise man gets more use from his enemies than a fool from his friends.
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).