LoL Vel'Koz players will find him to be a confusing champion to build out properly. You'll notice that his build is modified when he is up against either well-rounded or highly focused team compositions, showing you should not take the same Vel'Koz build every round of League of Legends
The most critical items to incorporate into your champ's build include: Ludens Sturm, Rabadons Todeshaube, and Splitter des Wahren Eises. Players who included these pieces in their builds had a much higher win rate than those who went for other Vel'Koz builds. Similarly, if you are facing a varied enemy team composition, you should strongly consider getting Vel'Koz the Zauberei, and Dominanz runes. In recent games, he won the largest fraction of his matches when equipped with these runes.
We came up with our Vel'Koz build suggestions by examining 30.435 recently ranked League of Legends rounds with him selected. We only propose the highest winrate Vel'Koz builds that were built by ranked League players enough times for us to advise them. With so many matches in our data, we are confident in our recommended builds.