Cassiopeia

Rated at maximum difficulty, Cassiopeia is a sustained-damage mage who trades burst combos for relentless, machine-gun output. Her core loop is landing Noxious Blast, a delayed poison zone, and then hammering Twin Fang — a short-cooldown attack that deals heavily increased damage to poisoned targets and heals her for a percentage of what it deals. Keeping poison uptime perfect while weaving constant Twin Fangs is a mechanical test few mid laners match.

Her passive, Serpentine Grace, makes all move speed bonuses more effective on her, and Noxious Blast grants bonus speed when it hits an enemy champion. Together they let her kite and reposition mid-combat despite having no dash — she outmaneuvers people instead of escaping them. Miasma reinforces this: clouds of poison that slow and, crucially, ground enemies, shutting off dashes and movement abilities. Dropping Miasma on an assassin mid-leap is one of the strongest anti-dive tools in the mage roster.

Petrifying Gaze is her famous ultimate coin-flip for opponents: enemies facing her are stunned, those turned away are merely slowed. Used against a committed engage, it can freeze an entire team; enemies who respect it are forced to fight her while looking away.

Cassiopeia deals damage-per-second more like a hypercarry marksman than a typical mage, which makes her a devastating late-game teamfighter who melts frontlines and heals through skirmishes via Twin Fang. She belongs to players who want an uncapped execution ceiling — precise positioning and relentless APM in exchange for elite sustained magic damage.