Defensive items like Zhonya's and Guardian's Angel can do a lot to get you through burst-heavy team fights, but the time it takes to build them is so long that many times that key fight you needed them most has already passed by the time you complete them. Stopwatch is meant to be that stopgap. It lets you invest towards the long term solution and still get that single moment of reprisal when you need it most.
COST : 600 gold
UNIQUE ACTIVE : Use Stopwatch to get into Stasis. Statis make Champions invulnerable and untargetable for 2.5 seconds, but unable to move, attack, cast spells, or use items during this time.
I'LL STILL CARRY THIS WATCH : Activating Stopwatch will transform it into Broken Stopwatch, which has no use but can still be upgraded. After breaking one Stopwatch, the shopkeeper will only sell you Broken Stopwatches.