Hwei vs Gragas

Poke with Devastating Fire (QQ) in lane: the fireball explodes on the first enemy hit and adds damage based on their max health.

Hit the same champion with two damaging spells: Signature of the Visionary (passive) then leaves a signature beneath them that explodes shortly after.

Pick the subject that fits the moment: Devastating Fire (QQ) for damage, Pool of Reflection (WW) to protect your allies, Crushing Maw (EE) to pull a group together.

Block a chokepoint with Molten Fissure (QE): the line of eruptions leaves pools of lava that slow and damage enemies.

Cast Spiraling Despair (R) on a champion surrounded by allies: the vision expands around them, slowing harder and damaging nearby enemies before it explodes.

Stay behind your minions: Body Slam (E) stops on the first enemy it meets, minions included.

Get out of the Barrel Roll (Q) area right away: the longer the barrel sits on the ground, the more its explosion hurts and slows.

Step up when Body Slam (E) hits nobody: its cooldown isn't reduced and stays at 14 to 12 seconds.

Spread out from your allies: Explosive Cask (R) knocks every enemy away from the impact, which can split you up or send you toward his team.