

Cassiopeia vs Vel’Koz Counter Pick
Matchup Summary
What the Data Means
Vel’Koz fights from 525 range, close enough to Cassiopeia’s 550 that neither mage out-pokes the other by much, yet Cassiopeia wins only 39.5% of these 109 games on patch 16.13.1 — a low winrate to hold against a similarly-ranged mage. Organic Deconstruction is the reason: every ability that lands stacks the debuff, and at three stacks Vel’Koz converts the fight into a burst of true damage that ignores whatever magic resistance Cassiopeia has stacked. Plasma Fission and Void Rift both threaten from safety, forcing Cassiopeia to walk into poison range with Noxious Blast and Miasma before Twin Fang can even connect.
A few numbers explain the rest of the gap. Vel’Koz’s 2,324 health at level 18 sits close to Cassiopeia’s 2,296, so armor and magic resistance decide most fights rather than raw health totals, and his 30 magic resist against Cassiopeia’s 32 is close enough that Twin Fang’s healing has to do the heavy lifting on its own. Life Form Disintegration Ray channels for 2.5 seconds, long enough for Cassiopeia to close with Petrifying Gaze if she survives the setup, but by then Organic Deconstruction has usually already detonated for a burst of true damage. With 109 games recorded, this is a modest sample, so the trend should be read as directional rather than fixed.
FAQ
No — current data marks this as a counter matchup: Vel'Koz has the statistical edge. Cassiopeia wins 39.5% of the recorded games.
39.5% from Cassiopeia's perspective, measured on patch 16.13.1.
109 ranked games at Emerald rank and above, across all regions.
The current Cassiopeia build — items, runes and skill order from the same data set — is on the Cassiopeia build page.