Ekko vs Cassiopeia

Not enough games

Heavy AP damageSustained DPSHeavy pokeHigh burst

Build vs Cassiopeia

The champion's reference build, for lack of enough games in this matchup

Starting items

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Core build

1—

2—

3—

Standard

4Magic pen

5—

Anti CC

4vs CC

Other options

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Strength by game phase

Passive, spells and ultimate

Serpentine Grace (P)

All Move Speed bonuses are more effective on Cassiopeia.

Cooldowns by spell rank

Level	Q	W	E	R
3	3.5s	24s	0.75s	–
6	3.5s	24s	0.75s	2m
9	3.5s	22s	0.75s	2m
11	3.5s	20s	0.75s	1m40
16	3.5s	16s	0.75s	1m20
18	3.5s	16s	0.75s	1m20

Tips to maximize your impact

Hit with your Q both ways
Throw Timewinder (Q) at a champion, then position so the device passes through them again on its way back: it expands into a slowing field, and the return hits again.
Three hits for your Resonance
Hit with Timewinder (Q) out and back, and weave in the empowered auto from Phase Dive (E): the third hit triggers Z-Drive Resonance (passive), with bonus damage and speed.
Step into your sphere
Cast Parallel Convergence (W) where the fight will happen, then step into the sphere when it appears: you stun the enemies inside and gain a shield.
Engage, then rewind time
Engage, deal your damage, then cast Chronobreak (R): you return to where you were 4 seconds earlier, in stasis, and recover health based on what you lost.

How to counter and exploit weaknesses

Dodge her poison
Dodge Noxious Blast (Q): without poison on you, Twin Fang (E) deals much less damage and doesn't heal her.
Walk around her clouds
Walk around the Miasma (W) clouds: inside, you're slowed and can't use dashes or jumps.
Turn your back on her R
Turn your back to her when she casts Petrifying Gaze (R): facing her, you're stunned; facing away, you're only slowed.

Patch 16.21.1