Thanatophobia

You harbor an overwhelming fear of death, and when it draws near, instinct overrides reason.

You are unwilling to knowingly take actions that would directly result in your death, as determined by the DM.

When reduced to 30 percent of your hit point maximum or fewer (rounded down), you gain the following benefits and drawbacks:

Adrenal Panic. Your speed increases by 10 feet while you are Frightened. This increase persists until the end of your next turn when regaining consciousness and are still at or below this hit point threshold. 

Fixation of Dread. When this feature activates you must succeed on a Wisdom saving throw (DC equal to 8 + your proficiency bonus + your Constitution modifier) or become Frightened of the creature, object, or effect that most recently caused you to fall below this hit point threshold.

• On a successful save, you are not frightened, but you still gain the benefit of Adrenal Panic until the end of your next turn.

• On a failed save, you have the frightened condition. You repeat the save at the end of each of your turns, ending the condition on a success.

(Allies may use their bonus action to console you, giving you advantage on the save.)

While frightened in this way, you have advantage on Dexterity (Acrobatics) checks.

You can be frightened by only one source at a time as a result of this feat.