Your Wisdom increase by one and your Constitution increases by one.

The beheaded were created and like all undead will perish when the necrotic energies that keep them moving no longer remain.

The beheaded are not good, nor are they evil, nor lawful, they are beings of chaos.

The beheaded possess humanoid corpses and as such can be of various ranges. Your size is Small, in your true form and medium if possessing medium sized humanoid. 

You have a base walking speed of 25 feet. If possessing medium sized humanoid corpse walking speed is 30.

 You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Your true form is a Small bundle of gaseous plant-like matter. While in this form you have a climbing speed of 25 feet, about 2-3 feet tall around 30 lbs. In true form you gain resistance to necrotic damage but also vulnerability of radiant damage. 

Over the course of a minute, you can integrate and inhabit the corpse of a Small or Medium humanoid creature that can not have been died for more that 12 hours. While inside this corpse you are considered the corpse and can move around as if you were that creature, though none of your game statistics change. As you use the corpse its decaying has halted due to you feeding off the decay factor instead of the body and you may use the corpse as long as you like. You have advantage on Charisma (Deception) and Performance checks to pass yourself off as that creature. As an action, you can jettison yourself from the corpse to a point you can see within 30 feet of you. 

When ever a humanoid would die and become a corpse within 30 feet of you, you may as a reaction leap from your accompanying host to the new corpse and possess it. also if you where to drop to 0 hit points and enter death saving throws you may eject your self from the corpse with one hit point remaining instead. you may use this feature every long rest.

You can push your host beyond its limits temporarily. While you inhabit the corpse of a creature, you can cast the jump spell once with this trait, requiring no components, and you regain the ability to cast it this way when you finish a long rest. Constitution is your spell casting ability for this spell.

You can speak, read, and write Common and one other language of your choice

You can only sustain your true from outside of a host for a certain allotted time frame, for every 4 hours spent outside a host you gain one level of exhaustion. allowing you to survive for 24 hours outside a host, before your gaseous plant like form shrink's in size and dissipates away and you die. With more levels of exhaustion your true form begins shrinking with every level and slowly dissipates.