Slight Buff: Synths get +3 in hit points. To all the manual hit point pals - you're welcome. 

All Synthetics find themselves more resilient than other races on average. Your Constitution score increases by 1.

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

Synthetics are as diverse as other races and have no alignment tendency.

Synthetics vary in height and build but are most commonly between 5 and 6 feet. Your size category is medium.

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.

Integrated Protection. Your body has built-in defensive layers, which can be enhanced with armor:

• You can don only armor with which you have proficiency. To don armor, you must incorporate it into your body over the course of 1 hour, during which you remain in contact with the armor. To doff armor, you must spend 1 hour removing it. You can rest while donning or doffing armor in this way.
• While you live, your armor can't be removed from your body against your will. 

 Mechanical Construct. You are not a living creature, you are a machine. You gain the following benefits.

• You have advantage on saving throws against being poisoned.
• You don’t need to eat or drink but can if you choose to.
• You don't need to sleep and magic can’t put you to sleep.
• You are immune to disease.
• Although you have no need to breathe you require oxygen to live. Suffocation takes twice as long for you.

Mechanical Rest. When you take a long rest, you must spend at least six hours in an inactive, motionless state, rather than sleeping. In this state, you appear inert, but it doesn't render you unconscious, and you can see and hear as normal.

Specialized Function. Having such a modular build and custom frames each Synthetic can specialize in some way. Pick one of the following specialized functions: 

Enhanced Neural Functions

Ability Score Increase. Your Intelligence score increases by 2.

Deep Learning. You gain proficiency in one skill of your choice and one proficiency of your choice in either a tool or language.

Pattern Recognition. You are able to read and comprehend information from text and code twice as fast. 

Domestic Functions. You gain proficiency in one language and your Charisma score increases by 2. 

Improved Muscular Functions

Ability Score Increase. Your strength score increases by 2.

Enhanced Motors. You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.

Metal Frame. Once per short or long rest you can focus your body’s nanites to glance a blow away from vital components. When you take damage, you can use your reaction to roll a d12. Add your Constitution modifier to the number rolled, and reduce the damage by that total.

Improved Pneumatics. Your body has incredible strength and is deadlier than normal. Your unarmed strikes deal 1d4 + your Strength modifier in bludgeoning damage instead of the damage normal for an unarmed strike. 

Augmented Mobility Functions

Ability Score Increase. Your Dexterity score increases by 2.

Optimized Strides. Your base movement speed is increased to 35 feet.

Combat Reactions. As a bonus action on each of your turns you may take the Disengage or Dash action a number of times equal to your proficiency bonus per day. These two actions pull from the same pool of charges. All used charges recharge on a long rest.