Mad Tinkerer is a light armor set. When you deal damage, you have a 10% chance to summon a Venomous Fabricant that charges the nearest enemy, dealing 9999 Shock Damage to all enemies in its path, knocking them into the air, and stunning them for 2 seconds. This effect can occur once every 10 seconds.
Mad Tinkerer is part of the Clockwork City DLC and drops in Clockwork City in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire light armor, jewelry and weapons for this set in the Apostle motif style.