Skitterwidget

Whenever the skitterwidget is subjected to lightning damage, it takes no damage and instead regains a number of hit points equal to the lightning damage dealt.

The skitterwidget doesn't require air, food, drink, or sleep.

The skitterwidget makes two attacks: one with its bite and one with its tail.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it is grappled by the skitterwidget (escape DC 13).

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage plus 10 (3d6) lightning damage, and if the target is a creature, it must succeed on a DC 15 Constitution saving throw or be stunned until the end of its next turn.

The skitterwidget imposes disadvantage on one attack roll made against a kiddywidget it can see within 5 feet of it.