Eldritch Spawn can live for anywhere between 100 years and 1000 years of age.

Your size is Medium.

Most Eldritch spawn are either Chaotic or Evil however you can have any alignment. 

Your base movement speed is 30 ft.

You may choose one Eldritch adaptation from the list below and you gain the benefits. You may choose another feature at 5th level and another at 7th.

Extra Eyes: You gain Darkvision for 60 ft.

Tentacle Appendages: When you make an attack you may attempt to grapple the target of the attack with a contested strength check. You may only use this ability once per turn.

Eldritch Hide: You gain resistance to necrotic and your choice of either slashing, piercing, or bludgeoning damage.

Extra Mouths: When a creature hits you with an attack the attacker takes piercing damage equal to your constitution modifier.

Nightmarish Visage: You may double your modifier for any check you make that requires Intimidation. You have disadvantage on all persuasion checks.

Unnatural Movements: Your movement increases by 5ft. Once per turn you may disengage with a creature as a free action.

Mystical Mind: You gain proficiency in perception. You gain advantage on constitution (Concentration) checks you make to maintain concentration on a spell.

Molded Resolve: Your AC increases by 1 if not wearing any armor. You may add your Wisdom Modifier to attack rolls you make instead of adding either strength or dexterity.

Coated Skin: You have advantage on rolls to escape from being grappled. Any creature you choose that comes into contact with you skin with their skin must make a constitution saving throw (DC = 14). On a failed save the creature is poisoned, takes 1d6 poison damage, and must repeat the save on each of its turns or take 1d6 more poison damage.

Deep Studies: You learn 2 extra languages of your choice.

Eldritch Spawn know how to speak, read, and write Common and Deep speech.