Small clever folk with innate magical lineages.
Racial Traits
Gnomish Cunning. You have Advantage on Intelligence, Wisdom, and Charisma saving throws.
Gnomish Lineage. Choose Forest Gnome or Rock Gnome. This lineage grants additional magical options. Intelligence, Wisdom, or Charisma is your spellcasting ability for lineage spells.
Darkvision. You have Darkvision out to 60 feet.
Subraces
Rock Gnome
You know Mending and Prestidigitation. You can spend 10 minutes casting Prestidigitation to build a Tiny clockwork device (AC 5, 1 HP) that repeats one chosen Prestidigitation effect when activated.
Forest Gnome
You know Minor Illusion and always have Speak with Animals prepared. You can cast it without a spell slot a number of times equal to your Proficiency Bonus per Long Rest, or with spell slots.