Make a super champion out of existing champions.
Some champion abilities just don't belong on other champions.
Passive: Crimson Pact (Vladimir) Q: Baleful Strike (Veigar) W: Soul Furnace (Sion) E: Flail Of The Northern Winds (Sejauni) R: Requiem (Karthus)
Take a look at these abilities, compare them with eachother and realize the monster I have just created.
Passive increases AP based on HP, and increases HP based on AP. Q gains AP on kills W gains HP on kills E deals % HP and AP damage in an AoE R deals unavoidable infinitely scaling AP damage to all champions
Passive:Requiem
passive 
Q 
W 
E 
R
You will never ever see or catch me.
Passive as Passive
W as Q
Q as E
Ult as Ult
So much damage in one hit. So in one hit at lvl 18 with no items you do 250 + 180 + 100 + 110 + 8% of missing hp + 36 + 45% AP + 120% ad + 60% AP + 80% AP
passive 
W 
E 
Q 
W
and the base stats of Jax is 250 + 180 + 100 + 110 + 8% of missing hp + 36 + 349 + 418 + 292.5 + 520 + 390 = 2645.5 + 8% missing hp in a line and an aoe around the original target on a 7.5 second cd
's Passive
Q : 
's W
W: 
's W
E: 
's Shield which is W???
R: 
's R
's resource, or rather, lack thereof.
's transformation ult.
's thing where her abilities do different things depending on whether you've targeted an ally/self or an enemy.
's passive.
's entire E could be the enemy-target half of one ability for one form.
Passive
Q: 
Ult
R: 
Ult
Q:
W:
E:
Troll A#$ passive
Q
Passive: Passive
Ult: Q
W: W
Ult: E
E