Gnome Cunning. The gnome has advantage on Intelligence, Wisdom, and Charisma saving throws against magic.

Tunnel Fighter. While adjacent to an obstacle that can provide at least three-quarters cover, the gnome benefits from having half cover even if targeted by an attack or effect that doesn't originate on the opposite side of the obstacle. Additionally, squeezing through a space doesn't cost the gnome extra movement.

Multiattack. The gnome makes two War Pick or Light Crossbow attacks.

War Pick. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage.

Light Crossbow. Ranged Weapon Attack: +2 to hit, range 80/320 ft., one target. Hit: 4 (1d8) piercing damage.

Seal the Breach. When an allied creature the gnome can see that is within 5 feet of it is reduced to 0 hit points, it can use its reaction to move up to half its speed towards the space that the creature occupied.

Uncanny Dodge. The gnome halves the damage that it takes from an attack that hits it. It must be able to see the attacker.