Medendus, The Shadow Support

My thoughts on character development stuff is a champion that is determined to show the world that shadow magic can be used for good. He is a very well intentioned individual but somehow always screws something up. Aegrescit medendo: the cure is worse than the disease. For in game, he'd be a melee support that relies on debuffing enemies and buffing allies. Most of the time he will do very little damage but in very specific scenarios he can dish out some pain. Basically a support that relies on teammates to do damage but if the enemy team doesn't respect the support, they will pay for it if they just ignore him and kill all his teammates first.

Passive:
Whenever a teammate dies near Medendus he is so overtaken with grief and guilt that his Shadow magic consumes him, transforming him into a shadow beast until he dies or exits combat for a few seconds. Transformation cleanses all CC active on him at the time of transformation. He loses access to all spells (although spells activated prior to transformation will still be in effect) and has increased stats. Basically Sion passive but with a teammate dying instead and doesn't lose health over time.

Q: Medendus attempts to heal the enemy champion but it doesn't quite work out. A targeted spell that applies a mark to the enemy champion target. After a delay the mark activates and deals a small flat amount of damage plus however much health the target has healed/regained from any source since the mark was applied.

W: Medendus throws out shadow magic in a cone in front of him that lightly damages and coats all enemies hit for a short duration. Allies are shielded for a portion of the damage they deal to targets that were hit with this spell. Cap of shield amount from minions and non-epic monsters. Medendus gets shielded for a smaller portion than allies do based on the damage he does.

E: Medendus creates a tether on a target enemy champion doing small DOT, stealing movement speed from them and giving the stolen movement speed to the nearest ally. The longer the target remains tethered the longer the duration the ally has of the movement speed buff. If there is no ally around, Medendus gets half of the movement speed buff himself.

R: Medendus transfers his shadow magic to targeted ally champion for a short duration cleansing them of CC at time of activation and giving them increased stats just like his passive, except they can use spells during duration. Medendus can self cast this spell for the same effect and duration it has on allies but will put his passive on cooldown for a short duration (like 20 seconds or something maybe) Skill points put into the ultimate also rank up stat increase while in passive form.

Thanks for reading :)