Zhonya's Hourglass

Gold 2900
Activate to become invincible but unable to take actions

+75 Ability Power
+45 Armor
+10% Cooldown Reduction

UNIQUE Active - Stasis: Champion becomes invulnerable and untargetable for 2.5 seconds, but is unable to move, attack, cast spells, or use items during this time (120 second cooldown).
Builds From

Seeker's Armguard Increases Armor and Ability Power 65 Gold Fiendish Codex Increases Ability Power and Cooldown Reduction 465 Gold Stopwatch Activate to become invincible but unable to take actions 600 Gold
Builds Into

Zhonya's Paradox Activate to become invincible but unable to take actions 1000 Gold