Yuumi vs Swain

While attached to an ally, steer Prowling Projectile (Q) with your mouse before it accelerates: once accelerated, it deals more damage and slows harder.

Hit a champion regularly, even with just a Prowling Projectile (Q): Feline Friendship (passive) then heals you, and then the next ally you attach to.

Stay attached to the same ally most of the time: Feline Friendship (passive) strengthens your bond with them, and your Best Friend empowers your spells while you're on them.

Attach to your carry with You and Me! (W): only towers can target you then, and Zoomies (E) gives them a shield, attack speed and mana.

Cast Final Chapter (R) while attached to steer its waves: each wave that hits slows enemies more and heals your allies.

Get out of the Nevermove (E) path as it comes back: it only roots on its return to Swain, then he can pull each rooted champion to him.

Leave the area as soon as Vision of Empire (W) appears: it strikes and slows 1.5 seconds later, and each champion hit gives him a Soul Fragment.

During Demonic Ascension (R), back off and hit from range if you can: he only drains nearby enemies, and his form ends when he stops draining.

If you have Grievous Wounds, apply it during Demonic Ascension (R): the drain heals him every second, and that healing keeps him alive.