Champion Concept : Mu the Voidborne

Mu | The Voidborne | Midlane AP Assassin (Ranged AA)

Passive [Return to the Void] Upon taking lethal damage open a portal where you died that lasts [1.5] minutes. You and your allies can then travel through a second portal at spawn in order to quickly return to where you died. (Has a [5] minute cooldown beginning after the portal closes)

Q [Voidborne Blades | Skill Shot] Throw out a large blade made of solidified shadow. If it connects with an enemy champion it deals [20/40/60/80/100]+[40]% AP damage. You can then recast the ability to teleport to them.

W [Dark Nimbus | AoE] Blades grow out from the cloud beneath you that deal [50/65/80/95/110]+[30]% AP damage to everybody around you.

E [Void’s Embrace | Select Target] You transform into shadowy smoke and possess an enemy champion’s body for [2] seconds. While possessing them you control where they move, but they move [60/55/50/45/40]% slower. Upon leaving their body you deal true damage equal to [5]% of their missing HP.

(Enemies who are possessed can still use abilities and auto attack normally)

R [Nothingness Incarnate | Self Buff] Become invisible and immune to crowd control for [3/4/5] seconds.