Spell shields can block both the placement of a bomb and it's detonation.
If the bomb lands directly on top of multiple units, it has the following priority system for whom to stick to:
Units already carrying a bomb.
Bombs will detonate immediately if its holder dies.
Time Bomb can cancel an enemy Recall despite dealing no damage.
If a bomb is placed on a stealthed ally, it will not be visible to the enemy team.
A ticking bomb will draw turret aggro.
A ticking bomb does not grant an assist if the target dies before it explodes.
A bomb will detonate an enemy Zilean's bomb when placed on the same unit. This does not prevent the enemy's damage.
If a bomb carrier takes lethal damage and triggers a revive effect, such as Chrono Shift or Guardian Angel, the bomb is removed like all other debuffs.
A ticking bomb will still detonate even if the carrier becomes untargetable. The carrier will still take damage unless they are also invulnerable through effects such as Frozen Tomb or Zhonya's Hourglass.
Movement speed cannot be reduced below 110, and slows that would reduce it below 220 are modified. To put it another way: a reduction of 99% will not reduce you to 3 movement speed, but rather it will reduce you closer to 110 than a weaker slow would.
Raw movement speeds above 415 and again above 490 are subjected to soft caps that reduce it at very high haste strengths. If the target ally of a maximum-rank Time Warp has no other movement modifiers other than Boots of Speed, their movement speed will not be almost doubled, but between 550 and 610.
COST: 125 / 150 / 175 mana
COOLDOWN: 120 / 90 / 60
Active:Zilean places a protective time rune on the target ally champion or himself for 5 seconds. If the target takes fatal damage during that time, they are instead put in stasis for 2 seconds and are revived with a set amount of health.