Elite Kobold

If two elite kobolds wielding any combination of picks and shovels combine their efforts, they gain a burrow speed of 15 feet through non-rocky soil.

The kobold has advantage on attack rolls against a target if at least one of the kobold's allies is within 5 feet of the target and the ally isn't incapacitated.

While in sunlight, the kobold has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

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

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

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.

D5

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