Grit

Once you reach 50% of your total health. You can pull from your pool of reserved energy. You gain the following effects that last for 1 minute.

• You gain an extra attack or cast of the cantrip used.
• You gain resistance to all damage types.
• And finally you gain temporary hit points equal to con modifier + character level.

After the effects ends you gain 2 level of exhaustion.

Once you use this ability. You can't do so again till the end of a long rest.