Gnomes are renowned for their crazy(and sometimes unstable) inventions be it with physical or magical items. 

When using a tool skill, you can add a D6 to your dice roll. If you roll one, do not add the result, instead subtract four from your dice roll. 

Accustomed to life underground, you have superior vision in dark and dim conditions. 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 colour in darkness, only shades of grey.

Gnome’s have an innate magical resistance, 

You have advantage on will saving throws against magic.

You known one cantrip and one level one spell which you can cast once per long rest without a spell slot that uses a DC10 + intelligence if you are not a spellcaster.

Both of these spells must be classified as Illusion.

You gain advantage on sleight of hand checks.

Gnomes are surprisingly resilient for someone of their size

You gain advantage on saving throws from being knocked prone,  knocked back or grappled

You have proficiency with artisan’s tools (tinker’s tools). Using those tools, you can spend 1 hour and 10 gp worth of materials to construct a Tiny clockwork device (1 hp). The device ceases to function after 24 hours (unless you spend 1 hour repairing it to keep the device functioning), or when you use your action to dismantle it; at that time, you can reclaim the materials used to create it. You can have up to three such devices active at a time.

When you create a device, choose one of the following options:

Clockwork Toy. This toy is a clockwork animal, monster, or person, such as a frog, mouse, bird, dragon, or soldier. When placed on the ground, the toy moves 5 feet across the ground on each of your turns in a random direction. It makes noises as appropriate to the creature it represents.

Fire Starter. The device produces a miniature flame, which you can use to light a candle, torch, or campfire. Using the device requires your action.

Music Box. When opened, this music box plays a single song at a moderate volume. The box stops playing when it reaches the song’s end or when it is closed.