Time Crunch (1/Long rest):

As an action, you can target a creature within 30 feet of you to temporarily accelerate its personal time flow. The creature can immediately move up to its maximum speed and take an action or bonus action. If you target yourself with this property, all you need is a bonus action to activate it.

If you use this property more than once before completing a long rest, you gain one level of exhaustion. Only when you finish a long rest can you remove a level of exhaustion gained in this way.

Second chance:

When the wearer of the amulet dies, allies can spend a total of 5 levels of exhaustion in any way they wish to give the wearer an extra chance to make a Death save (DC6 + 2 subsequent to each future attempt).

The wearer can give the same chance to an ally for 4 levels of exhaustion (DC remains 6/8 or 10).

Notes: An amulet created by Chronos, made of the purest silver and containing a curiously shaped hourglass. It is said that this object is presented to those for whom a second chance at life would enable them to make a significant impact on the world. It doesn't matter how, as long as the balance of the world is restored. This item starts out rare and through time, achievement and growth, evolves to very rare and then legendary (depending on DM).