Pantheon vs Swain

Start your trades with Shield Vault (W): you leap onto your target and stun them, so Comet Spear (Q) can't miss.

Tap Comet Spear (Q) for a short thrust that refunds part of the cooldown, or hold it to throw your spear farther.

Raise Aegis Assault (E) against enemy burst: you ignore damage from that direction, except from towers.

Roam with Grand Starfall (R): you leap from long range onto the chosen area, and the spell instantly readies Mortal Will (passive).

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.