Matchup
You are stronger late game — farm safe and avoid early trades.
Build vs Yuumi
Build adapted to this matchup
Starting items
Core build
Standard
Summoner spells
100%Anti AD
Anti CC
Anti Tank
DPS
Other options
Domination
Electrocute
Sudden Impact
Sixth Sense
Ultimate Hunter
Precision
Presence of Mind
Cut Down
Power Spikes
Strength by game phase
Kassadin
YuumiYuumi's abilities
Passive, spells and ultimate
Periodically, when Yuumi strikes a champion with an attack or ability, she restores health to herself and the next ally she Attaches to.While Attached, Yuumi generates a special bond with her allies. The ally with the strongest bond enhances Yuumi's abilities while she is Attached to them.
Cooldowns
Cooldowns by spell rank
| Level | Q | W | E | R |
|---|---|---|---|---|
| 3 | 6.5s | 0s | 10s | – |
| 6 | 6.5s | 0s | 10s | 2m |
| 9 | 6.5s | 0s | 10s | 2m |
| 11 | 6.5s | 0s | 10s | 1m50 |
| 16 | 6.5s | 0s | 10s | 1m40 |
| 18 | 6.5s | 0s | 10s | 1m40 |
Playing against Yuumi
How to counter and exploit weaknesses
Focus the Yuumi host: she can't be targeted while attached, kill her host.
Punish Yuumi when she detaches to proc her passive — that's the moment she's vulnerable.
Champions with high burst can kill the host despite Yuumi's heals.
Grievous Wounds on the host reduces Yuumi's heals on her target.
Source: op.gg + LTL Engine · Patch 16.9.1 · May 9, 2026