
Passive
Time In A Bottle
Zilean stores time as Experience and can grant it to his allies. When he has enough Experience to finish an ally's level up, he can right-click them to impart it. Zilean receives as much Experience as he gives.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Zilean stores time as Experience and can grant it to his allies. When he has enough Experience to finish an ally's level up, he can right-click them to impart it. Zilean receives as much Experience as he gives.

Q
Tosses a bomb to target area that sticks to units that come near it (prioritizes Champions). It detonates after 3 seconds, dealing area of effect damage. If a Time Bomb is detonated early by another Time Bomb, it also stuns enemies.
Base values from ability rank 1 upward.

W
Zilean can prepare himself for future confrontations, reducing the cooldowns of his other basic abilities.
Base values from ability rank 1 upward.

E
Zilean bends time around any unit, decreasing an enemy's Move Speed or increasing an ally's Move Speed for a short time.
Base values from ability rank 1 upward.

R
Zilean places a protective time rune on an allied champion, teleporting the champion back in time if they take lethal damage.
Base values from ability rank 1 upward.