Malfunction. Whenever the autognome takes 15 damage or more from a single source and isn't reduced to 0 hit points by that damage, roll a d20 to determine if it suffers a malfunction:
Multiattack. The autognome makes two Shock attacks.
Shock. Melee or Ranged Weapon Attack: +3 to hit, reach 5 ft. or range 60 ft., one target. Hit:7 (2d6) lightning damage.
An autognome is a mechanical gnome that resembles the rock gnome who created it, though it could never be mistaken for a gnome. Regardless of what its insides are made of, it has a metallic outer casing painted with gnomish features. It walks with a stiff gait, clanking, wheezing, whirring, and buzzing wherever it goes.