Sneak Attack +3d6 damage 1/round against targets the Splint has advantage against
Cunning Action: Splint can take the Hide, Dash, Sleight of hand actions or Disengage action as a bonus action on each of its turns.
Dagger: Melee or Ranged Weapon Attack, +6 to hit, reach 5 ft., range: 20/60, one target. Hit: 1d4+3 Piercing damage.
Hand Crossbow. Ranged Weapon Attack, +6 to hit, range:30/120, Loading. one target. Hit: 1d6+3 Piercing damage.
Sneak Attack +2d6 damage 1/round against targets the Goblin has advantage against
Cunning Action: The goblin can take the Hide, Dash, or Disengage action as a bonus action on each of its turns.
Assassinate: The goblin has advantage on any creature that has not yet taken an action in combat. In addition, hits against surprised targets are automatically critical hits.
Dagger: Melee or Ranged Weapon Attack, +4 to hit, reach 5 ft., range: 20/60, one target. Hit: 1d4+2 Piercing damage.
Darts (5): Ranged Weapon Attack, +4 to hit, Range 20/60, one target. Hit: 1d4+2 Piercing damage + poison
Poison: Many goblin assassins use poison, particularly on their darts (which are often used to cover an escape). Carrion Crawler Mucus (DMG), Serpent Venom (DMG), and Basic Poison (PHB) are all common.