Lux vs Cassiopeia Counter Pick

Cassiopeia sits at the top of the difficulty scale with a rating of 10, and that number does real work in the result: Lux wins 55.1% of 316 games recorded on patch 16.13.1. Cassiopeia’s damage comes almost entirely from Twin Fang, a short-cooldown spell chained repeatedly against poisoned targets, and every missed application costs both the damage and the healing it returns.

Both champions attack from 550 units and deal magic damage, so the mid lane phase is a pure spacing contest with no itemisation asymmetry. Lux’s edge is that her threat resolves as one decision rather than a sustained sequence — Light Binding into Lucent Singularity into Final Spark takes a few seconds, while Cassiopeia needs uninterrupted time standing inside her own poison. Illumination adds bonus magic damage to Lux’s next attack after any damaging spell, converting a single landed skillshot into a real portion of a 630 health pool.

The reverse threat is Miasma, which grounds enemies and blocks movement abilities. Lux has none, so grounding costs her only the slow — an unusual case where a lack of mobility is close to irrelevant. Petrifying Gaze stuns only enemies facing her, so turning away during the cast downgrades it. Movement speed reads 335 to 330, and Serpentine Grace makes every speed bonus she buys more effective. Numbers are on the Cassiopeia champion page.