Lillia vs Rammus

Hit with the edge of Blooming Blows (Q), not the center: only the outer edge adds true damage.

Hit enemies with your spells and keep your distance: Blooming Blows (Q) gives you a stack of move speed on each hit, enough to kite and dodge.

Start the fight from range with Swirlseed (E): it damages, slows and reveals, and if it hits nothing, it rolls on to the first enemy or wall.

Before Lilting Lullaby (R), hit as many enemies as you can: Dream-Laden Bough (passive) marks every target of your spells, and only marked ones fall asleep.

Stay behind your minions: Powerball (Q) stops on the first enemy it collides with, minions included.

If you deal magic damage, lean on it in trades when Defensive Ball Curl (W) is on cooldown: without it, his resistances drop to those of an ordinary tank.

If you're ranged, don't let him reach melee range when Frenzying Taunt (E) is ready: its range is short, and it forces you to attack him.

Get out of the Soaring Slam (R) area fast: aftershocks repeat the slow there, and if cast during Powerball (Q), it adds a knock-up in the center.

Don't attack during Defensive Ball Curl (W): each auto returns magic damage to you, and he gains armor and magic resist.