Vayne vs Olaf

Hit the same target three times in a row, with autos or spells: on the third hit, Silver Bolts (W) adds true damage based on their max health.

Slip a Tumble (Q) between two autos: you reposition, and your next attack deals bonus damage. Its cooldown drops from 6 to 2 seconds.

Position yourself so that Condemn (E) pushes your target into a wall: if they hit terrain, they're stunned and take more damage.

Play safe while you're missing your first items: Vayne mostly shines later, when Silver Bolts (W) cuts through big health pools.

During Final Hour (R), each Tumble (Q) makes you invisible for a moment and comes back faster: tumble to reposition while the enemy can't target you.

Dodge Undertow (Q): it's his only slow, and without a dash, he can only reach you on foot.

Take a trade when his axe has landed far from him: until he picks it up, Undertow (Q) keeps its 9-second cooldown.

Avoid long trades when he's low on health: Berserker Rage (passive) gives him attack speed and life steal based on his missing health.

If you have CC, save it for after Ragnarok (R): while it lasts, no CC stops him, and it has a 100 to 80 second cooldown.