Available once a character is bloodied (at half or fewer max HP). On your turn, you can pre-mark a number of death saving throw failures in exchange for an immediate benefit. Marked failures stay on your sheet until you finish a long rest. You cannot have more than 3 death saving throw failures marked at once. If you drop to 0 HP while already at 3 marked failures, this is an instant death; no death saving throws are made.

CostBenefit (pick one)
1 death save failureExtra Dash and Disengage as Bonus Action
1 death save failure+5 bonus to a d20 Test you just failed
1 death save failureReroll a failed Attack Roll
2 death save failuresWhen you hit with an attack, each Damage Die deals maximum damage instead of rolling
3 death save failuresExtra Attack or Magic Action
3 death save failuresRegain one expended Spell Slot (level 1–5)

Death Saving Throw Options

While making death saving throws at 0 HP, each round you have three options:

OptionResult
Roll and succeedChoose to give an ally within sight Heroic Inspiration instead of counting it as a personal success, or stabilize yourself if you currently have zero death save failures
Roll and failNo Heroic Inspiration
Skip the rollAutomatically fail, but give an ally within sight Heroic Inspiration