Mining Pick

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage.

Sling

Ranged Weapon Attack: +5 to hit, range 30/120 ft., one target. Hit: 5 (1d4 + 3) bludgeoning damage.

Lantern Splash (Recharge 5-6)

The elite kobold opens its miner's lantern and splashes burning oil in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 14 (4d6) fire damage on a failed save, or half as much damage on a successful one.

Small but Fierce

Two elite kobolds within 5 feet of each other can combine their actions to slam their mining picks into the ground and split the earth in a 20-foot line that is 5 feet wide, extending from one of the pair. Each creature in that line must make a DC 13 Dexterity saving throw. On a failure, a creature takes 7 (2d6) bludgeoning damage and is knocked prone. On a success, a creature takes half the damage and isn't knocked prone.