Sergei; The Legion of Souls. Champion Concept.

On the battlefields of Noxus' conquests, the dead are often disposed of, their souls, not always so lucky. Those who do not earn their afterlife are left on Runeterra to wander aimlessly for eternity. One mage, foolish as he was, sought to claim the power of all the souls left on this world. He had no Idea the the pain it would bring him, as the soul, is the matron of all strength, and strength never dies. The souls he consumed into his body fused to his soul... Now, We are Sergei. We are Endless, We Are LEGION.

So, This guy gets stronger the more things die around him, but, he has to used a % of his strength to cast their abilities, meaning his burst gets weaker with each ability used, meaning if he misses some of his abilities, there is a window where the rest are much weaker.

Passive; Soul Pen. Sergei gains a soul for every Minion(Allied or Enemy), Monster, Or Champion that dies within a huge distance of him. Each soul grants 0.5 AP. Every 10th soul also grants 15 mana.

Q; Soul Orb. Sergei launches a very slow moving(Like slower than Morde runs without boots) beam of pure energy in a target direction, Using Half his souls to do so.(50% of soul stacks) Dealing (X) magic damage to any target hit, Upon hitting a target, or terrain, the orb will begin to return to Sergei rapidly, dealing (Half X) magic damage to all units it passes through. Once the orb returns to Sergei he regains all the soul stacks used to cast it.

W; Soul Pillar. Sergei channels a pillar of souls at a target location, Using half his souls to do so.(50% of soul stacks) This pillar of souls will stay in its location until W is recast or until Sergei runs out of mana. When Soul Pillar is stopped Sergei regains all soul stacks used to cast it.(The Pillar is terrain not a damage spell)

E; Soul Pike. Sergei summons a pit of soul spikes on a target location, Using 75% of his soul stacks to do so. Stunning any enemy hit for (Y) Second(s) and dealing (Y) Magic damage. After the spikes disipate Sergei regains all the soul stacks used to cast it.

R; Soul Legion. 100% soul stacks used on cast. The Legion removes them-self from Sergei's body, Becoming a formless blob of souls. The Legion Will spin quickly around Sergei's body, Dealing (X) Magic damage + 1 true damage for every soul stack used to cast the ability, as well as knocking all enemies hit back a substantial distance. Two(2) Seconds after Soul Legion is cast The Legion reunites in Sergei's body. Regaining 100% of soul stacks used to cast it, -1 stack for every champion hit.