Zilean stores time as Experience.
When he has enough Experience to finish an ally's level, he can right-click them to impart it. Zilean receives as much Experience as he gives. Cannot be used in combat.
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.
Zilean can prepare himself for future confrontations, reducing the cooldowns of his other basic abilities.
Zilean bends time around any unit, decreasing an enemy's Movement Speed or increasing an ally's Movement Speed for a short time.
Zilean places a protective time rune on an allied champion, teleporting the champion back in time if they take lethal damage.