Rek'Sai vs Lillia

Save Furious Bite (E) for when your Fury bar is full: the bite then deals true damage.

Come out of the ground with Un-burrow (W) under your target: they and nearby enemies take a knock-up, so you can engage or interrupt a channel.

Cast Void Rush (R) on an enemy you damaged in the last few seconds: untargetable, then unstoppable, you lunge at them, and your Un-burrow (W) comes back.

Cast Burrow (W) before crossing the map: your Tremor Sense reveals to your team nearby enemies who move unseen.

Dig with Tunnel (E) near lanes to gank and on your escape routes: each tunnel lasts and can be reused, but an enemy standing on an entrance destroys it.

Against Blooming Blows (Q), stick to her or back out of range: only the outer edge of the zone adds true damage.

Get out of the center of Watch Out! Eep! (W): the zone deals much more damage there than at the edge.

Dodge her spells, even Swirlseed (E), which rolls to the first enemy: each one marks you for Lilting Lullaby (R), which puts every marked enemy to sleep.

If you have CC, use it on her: with no dash, she relies on the move speed Blooming Blows (Q) gives her for each spell that hits.