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

Pack Tactics. The kobold has advantage on an attack roll against a creature if at least one of the kobold's allies is within 5 feet of the creature and the ally isn't incapacitated.

“Charge!”.  If the kobold boneflint moves at least 20 feet towards a target in a straight line, then it may make one shield bash attack as a bonus action before it attacks with a spear.

Kobold Bone Spear.  Melee Weapon Attack: +4 to hit, reach 5 (or 10) ft., one target.  Hit: 5 (1d6+2) piercing damage.  The kobold may choose to attack a target that is 10 feet away, but the attack roll is made with disadvantage.

Shield Bash.  Melee Weapon Attack: +2 to hit, reach 5 ft., one target.  Hit: 2 (1d4) bludgeoning damage and the target must pass a DC 10 Strength Check or be knocked prone.

“Run, Friends!” (1/Day).  The kobold takes the Dodge Action, and gains resistance to bludgeoning, piercing, and slashing damage until the start of its next turn.  The kobold must be within 5 feet of an enemy, and stay within 5 feet of an enemy when using this ability, or this ability fails.  At least one kobold must take the dash action and run away from the battle on their turn or this ability fails.

Kobold Mushroom (1 or 1d4-1 mushrooms).  The kobold may eat one mushroom to regain 1 hit point and gain advantage against all Wisdom Saving Throws for one hour.  The kobold may eat another mushroom on a following turn and benefit from the hit point recovery, but may not stack the duration benefit for the Wisdom Saving Throw bonus.