Hollow One

Ageless. You don't age, and effects that would cause you to age don't work on you.   Cling to Life. When you make a death saving throw and roll 16 or higher, you regain 1 hit point.   Unsettling Presence. As an action, you can unsettle a creature you can see within 15 feet of you. The target has disadvantage on the next saving throw it makes within the next minute. Constructs, undead, and creatures that can't be frightened are immune to this feature. Once you use this feature you can't use it again until you finish a long rest.