Lee Sin vs Bel'Veth

For the Insec, land Sonic Wave (Q), reach the target, ward behind them and jump to it with Safeguard (W): Dragon's Rage (R) kicks them toward your team.

Wait until your target has lost health before casting Resonating Strike (Q): its damage scales with missing health, and you have 3 seconds to cast it.

Cast Safeguard (W) on an ally, minions included, or on a ward to dodge or escape: it has a 7-second cooldown and also shields the targeted allied champion.

Look for invades, ganks and objectives early on: Lee Sin is strongest early, and his impact drops once the others have their items.

Back off when she takes her true form with Endless Banquet (R): she gains health, range and attack speed, and with enough stacks, the form lasts until she dies.

Dodge Above and Below (W): if it hits you, you take a knock-up and her Void Surge (Q) in your direction is refreshed instantly.

If you're the lowest-health enemy near her, get out of Royal Maelstrom (E) range: every slash targets you, and she gains lifesteal and damage reduction.

Deny her large monsters and kills: Death in Lavender (passive) gives her permanent attack speed for each one.