gemstone poof/shatter

when the gem's HP is 0 they enter there gem stone and are in complete cover, the gem can regrow there form after a short rest and be back to half HP, if they are not given the time of a short rest some one can have the opportunity to shatter rely killing the gem.

You can summon a weapon (decided at Character creation) from your gem stone as a bonus action. You may have up to 2 of them at a time. You have disadvantage on all attack rolls that are made with anything other than this weapon.

 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.

You have advantage on saving throws against being charmed, and magic can't put you to sleep

does not sleep 

fusion

you fuse with a character that is with in 5 feet of you the character has to be the same size as you and if is a monster it cant be a CR hire then 5 until you are a level,9. the character must make a constitution saving throw and beat a DC of 10 or be fused with you for one hour, when you are fused with another character you have a combined HP of half your HP and half of the character HP to make the max HP of the fusion when the time is up of if your fusion's HP hits 0 you separate and are at normal HP.

gemstone storage

you can store thing in your gem like a bag of holding can. you have an infinite space in you gem that is dedicated to storing your stuff and is is were you summon your weapons from and everything, it is hard to store living things and you must make a DC saving throw or 15 to put a living thing in it.

Ability Score Increase

Your Charisma score increases by 2. In addition, one other ability score of your choice increases by 1.

Age

your body is made of light so you don't age or need to sleep or eat for all intent and purposes you body is like a construct

Shapechanger

As an action, you can change your appearance. You determine the specifics of the changes, including your hair length, sex, height and weight, though none of your game statistics change. You can’t duplicate the appearance of a creature or object  you’ve never seen, and you must adopt the color of your gem stone in what ever form your in.

You stay in the new form until you use an action to revert to your true form or until you die.

Light-Forged Body

Your body is a projection of hard light with mass. 
You have advantage on saving throws against poison and have resistance against poison damage. 
You are immune to diseases.
You do not need to eat, drink, or sleep but have the ability to do so.
You only need to enter a 4-hour trance to rest each night (or day) to absorb light from around you. This light may come from the sun or the moon, other natural sources like lanterns and fire, or magical sources like the Light Spell.
If you do not meet this requirement in a 48 hour period, your body visibly dulls in color and bags form under your eyes, giving you a sickly appearance. You then have a disadvantage on all constitution saving throws and obtain a level of exhaustion.  
If you do not meet this requirement after a total of 72 hours, your body retreats into your gem until it meets its light requirement.