Death Fire Touch: Jhin and Vi
Okay so jhin's best mastery is Death Fire Touch, the reason is because his R and his W apply the single target burn damage and not the AOE burn damage.
Jhin's W will travel through all minions and then stop at the first champion hit, this is the same for his R.
On Vi, her "Vault Breaker" will travel through all minions and stop at the first champion hit BUT she applies the AOE burn damage and not the single target burn damage.
Your move riot.
Note:This is not about Vi, her Q works roughly the same as Jhin's W but for some reason jhins is counted as single target while Vi's is counted as AOE it just doesn't make sense.