Tachycardia

When your body is small and fragile, your heart often compensates by giving you an abnormal heartrate in order to survive. This is a trait often seen in rabbits and other herbivores, when everything around you is the things that wants you dead.

On your turn, you can take one hasted action, That action can be used only to take the Attack (one weapon attack only), Dash, Disengage, Hide, or Use an Object action. Once you use this ability you cannot do so until you complete a long rest.

Once per turn, when you drop to 0 hit points without outright dying, you can choose to immediately roll your death saving throw with advantage.