Gnar vs Swain

As Mini Gnar, poke and kite with Boomerang Throw (Q): it slows, and catching it on the way back lowers its cooldown.

As Mini Gnar, land three hits on the same target: Hyper (W) then adds damage based on their max health and gives you move speed.

Engage when your Rage Gene (passive) bar is almost full: your next ability turns you into Mega Gnar, tankier and with new spells.

Cast GNAR! (R) to send enemies into a wall: those who hit it are stunned and take more damage, the others are only knocked back.

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.