Your Strength score increases by 2 and your Dexterity score increases by 1 .

You have darkvision out to a range of 120 ft.

You can not speak with your voice so through the years you have developed the ability to speak through your mind . You can telepathically talk to any creature you can see within 30 feet that at least speaks one language.

You can choose a weapon which you are proficient with and connect your soul with it . You perform a ritual for 1 hour with the weapon no more than 5 feet away from you . You can not lose this weapon by any means , exept the use of the wish spell . You can call back on it with a bonus action . Critical strikes with this weapon now deal 1 more die of the same type of damage. You can choose the appearance of the weapon , without it changing stats . As you call on your Eternal Weapon , you can use your action instead of the bonus and instantly attack any creature within your melee range. 

Your base walking speed is 40 feet . You can climb and swim at half your speed.

Shadows are taller than humans . Your size is Medium and your height is ranging from 6 to 8 feet tall. You can easily fit wherever humans can but your whole build seems to be largerer.

You can speak and write common and one language of your choise.

Shadows may have the characteristics of a certain age , but that lasts for ever. Shadows can not die of age. 

Shadows have all kinds of alignements and it mostly depends on what they believe of the other alive races.

Your whole body is covered in amor as if you where just an animated armor set. You body , though , feels the gaps and adds the depth to your silhouette. Your eyes are just eye socets with small blue or purple flames that do not produce any light in your skull but can be seen from afar if not covered properly. Your weapon also takes the same shadowy appearance as the rest of your body.

Your otherwordly nature becomes even stronger , providing you with the power to telepathically move objects at your will. At 17th level can use the spell telekinesis at will but only control objects that weight 500 pounds or less . This ability can also be used to empower your weapon's next attack , once you use this feature of the ability you can't use the ability again until you finish a long rest .