Zilean rework concept
Zilean is meant to be the original Time-slinging sorcerer, playing with the time-space continuum with ease. As it stands, he is in his "Kobe" phase, which kind of sucks. Time travel is really cool, so lets put that in this guys kit.
Passive: Chronodisplasia Zileans leaves a trail of "Instances of Zilean" behind him, lasting 5 seconds. Zilean gains vision from these instances and may cast spells/basic attack using them for range. (Think of it like if ekkos trail were made up of Azir soldiers/Zed shadows, but without overlapping damage) Zilean experiences time at a different rate then any other. As such, the time frame of everything on him is shortened by 10% (DOTs do their thing on him 10% faster, his cooldowns come up 10% faster, but is not CDR, his attack and movement speeds are 10% faster, health and mana regeneration occurs 10% faster)
Q: Time Bomb 1st cast: Zilean blinks to a target location, freezing time in an area around him for up to 5 seconds. Units in this area have all regeneration and DOT effects stalled. They cannot move, cast spells, or attack. QSS is also disabled. Allies and Enemies are effected, but enemies cannot observe what zilean does in this area. Projectiles are stopped midair, but will damage zilean if he walks into them. If someone tries to enter the frozen area, they are frozen at the edge of the area. Noone outside the area may target frozen targets, and skillshots are frozen at the edge. 2nd cast: Zilean places an explosive rune at his current location. 3rd cast: Zilean returns to the location from which he originally cast Time Bomb, unfreezes time, and detonates his explosive, dealing magic damage to all enemy units who had their time frozen.
W: Chronoshift Zilean blinks back to a targeted instance in his trail, changing his current health and mana to the mean of what they were when he cast chronoshift and what they were at the point in time he is traveling to, as well as reducing the cooldowns of his abilities by 10 seconds.
E: Time warp Zilean warps time and space in an area around a target unit for 6 seconds. Allies in this area gain 40/45/50/55/60% movement and attack speed, while the rate at which their cooldowns decrease is changed to 1.1/1.2/1.3/1.4/1.5 seconds per second while they are in the area. Enemies inside have their movement and attack speed slowed by 40/45/50/55/60%, and the rate at which their cooldowns decrease is changed to 1/0.9/0.8/0.7/0.6 seconds per second. This may target an instance on zileans trail.
R: Paradox On enemy cast: Zilean negates the existance of target champion for 3 seconds. Upon returning to existance, they take damage from all projectiles which crossed paths with where they were. On ally cast: Zilean places a protective rune on a target champion for 7 seconds. If that champion takes lethal damage, they revive at a location of their choosing (Between the location of death, where they were when Paradox was cast on them, where they were 5 seconds ago, or next to zilean) with 700/1000/1300 (+some ap ratio) health.
This could lead to some confusing teamfights, and that is what I am going for. If anything needs further explanation, ask.